{"id":50972,"date":"2026-04-15T18:28:07","date_gmt":"2026-04-15T22:28:07","guid":{"rendered":"https:\/\/www.inmotionhosting.com\/support\/?p=50972"},"modified":"2026-04-15T18:36:42","modified_gmt":"2026-04-15T22:36:42","slug":"fix-max-children-error","status":"publish","type":"post","link":"https:\/\/www.inmotionhosting.com\/support\/server\/php-fpm\/fix-max-children-error\/","title":{"rendered":"How to Fix the PHP-FPM &#8220;server reached max_children&#8221; Error"},"content":{"rendered":"<figure class=\"wp-block-image size-large is-style-default\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"538\" src=\"https:\/\/www.inmotionhosting.com\/support\/wp-content\/uploads\/2021\/06\/php-fpm-reached-1024x538.png\" alt=\"php-fpm:  Fix the Max_children error\" class=\"wp-image-74338\" srcset=\"https:\/\/www.inmotionhosting.com\/support\/wp-content\/uploads\/2021\/06\/php-fpm-reached-1024x538.png 1024w, https:\/\/www.inmotionhosting.com\/support\/wp-content\/uploads\/2021\/06\/php-fpm-reached-300x158.png 300w, https:\/\/www.inmotionhosting.com\/support\/wp-content\/uploads\/2021\/06\/php-fpm-reached-768x403.png 768w, https:\/\/www.inmotionhosting.com\/support\/wp-content\/uploads\/2021\/06\/php-fpm-reached.png 1200w\" sizes=\"auto, (min-width: 1360px) 876px, (min-width: 960px) calc(61.58vw + 51px), calc(100vw - 80px)\" \/><\/figure>\n\n\n\n<p>The PHP-FPM \u201cserver reached max_children\u201d warning is a common performance issue on VPS and dedicated servers using PHP-FPM (FastCGI Process Manager). It appears in the PHP-FPM error log when the pool has exhausted all available child processes and cannot handle new incoming PHP requests. This often results in slow page loads, 502\/504 Gateway Timeout errors for visitors, or queued requests.<\/p>\n\n\n\n<div class=\"wp-block-kevinbatdorf-code-block-pro\" data-code-block-pro-font-family=\"Code-Pro-JetBrains-Mono-NL.ttf\" style=\"font-size:clamp(16px, 1rem, 24px);font-family:Code-Pro-JetBrains-Mono-NL,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;line-height:clamp(26px, 1.625rem, 39px);--cbp-tab-width:2;tab-size:var(--cbp-tab-width, 2)\"><pre class=\"shiki github-dark\" style=\"background-color: #24292e\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color: #B392F0\">WARNING:<\/span><span style=\"color: #E1E4E8\"> [pool <\/span><span style=\"color: #9ECBFF\">www]<\/span><span style=\"color: #E1E4E8\"> <\/span><span style=\"color: #9ECBFF\">server<\/span><span style=\"color: #E1E4E8\"> <\/span><span style=\"color: #9ECBFF\">reached<\/span><span style=\"color: #E1E4E8\"> <\/span><span style=\"color: #9ECBFF\">max_children<\/span><span style=\"color: #E1E4E8\"> <\/span><span style=\"color: #9ECBFF\">setting<\/span><span style=\"color: #E1E4E8\"> (5), consider raising it<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n<p>This guide explains the root causes, how to diagnose the issue accurately, calculate safe values for <code>pm.max_children<\/code>, and apply fixes. It is tailored for InMotion Hosting <a href=\"\/vps-hosting\">VPS<\/a>\/dedicated servers (cPanel\/WHM with UltraStack or custom PHP-FPM setups) running on AlmaLinux, CentOS, Ubuntu, or similar distributions. The information reflects current best practices as of 2026.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How PHP-FPM Process Management Works<\/h2>\n\n\n\n<p>PHP-FPM maintains a pool of worker processes (children) to handle PHP requests efficiently without spawning a new process for every request. The key directive is <strong>pm.max_children<\/strong>, which sets the hard limit on simultaneous PHP workers per pool.<\/p>\n\n\n\n<p>When all children are busy processing scripts (often waiting on databases, APIs, or slow code), new requests cannot be served immediately. If the backlog grows, the web server (Apache or NGINX) may return errors to users.<\/p>\n\n\n\n<p>PHP-FPM supports three process manager modes:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>static<\/strong>: Fixed number of children (best for high-traffic, dedicated resources; fastest but uses constant memory).<\/li>\n\n\n\n<li><strong>dynamic<\/strong>: Starts with <code>pm.start_servers<\/code> and scales between <code>pm.min_spare_servers<\/code> and <code>pm.max_spare_servers<\/code> (flexible balance).<\/li>\n\n\n\n<li><strong>ondemand<\/strong>: Spawns processes only when needed and kills idle ones after <code>pm.process_idle_timeout<\/code> (lowest memory usage, slight startup delay).<\/li>\n<\/ul>\n\n\n\n<p>Most shared or lightly loaded VPS setups default to <strong>dynamic<\/strong> or <strong>ondemand<\/strong> with a conservative <code>pm.max_children = 5.<\/code><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Common Causes of the max_children Error<\/h2>\n\n\n\n<p>Several factors can trigger this warning:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>High concurrent traffic<\/strong>: Legitimate visitors, bots, or traffic spikes exceed the current limit.<\/li>\n\n\n\n<li><strong>Slow or inefficient PHP scripts<\/strong>: Long database queries, unoptimized plugins\/themes (especially WordPress), external API calls, or memory leaks keep workers occupied longer.<\/li>\n\n\n\n<li><strong>Insufficient <code>pm.max_children<\/code> setting<\/strong>: The default value of 5 is often too low for real-world VPS usage.<\/li>\n\n\n\n<li><strong>Resource bottlenecks<\/strong>: Low available RAM, high CPU load, or swapping causes processes to run slowly, tying up workers.<\/li>\n\n\n\n<li><strong>Missing caching<\/strong>: No opcode cache (OPcache), object cache (Redis\/Memcached), or full-page cache forces every request through PHP.<\/li>\n\n\n\n<li><strong>Bots or attacks<\/strong>: Crawlers, XML-RPC abuse, or brute-force attempts generate excessive requests.<\/li>\n<\/ul>\n\n\n\n<p>Always investigate server resources and application performance before simply raising limits. Over-allocating children can lead to Out-Of-Memory (OOM) kills and server instability.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Step 1: Diagnose the Problem<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Check PHP-FPM Error Logs<\/h3>\n\n\n\n<p>Locate the log for your pool (usually www or domain-specific):<\/p>\n\n\n\n<div class=\"wp-block-kevinbatdorf-code-block-pro\" data-code-block-pro-font-family=\"Code-Pro-JetBrains-Mono-NL.ttf\" style=\"font-size:clamp(16px, 1rem, 24px);font-family:Code-Pro-JetBrains-Mono-NL,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;line-height:clamp(26px, 1.625rem, 39px);--cbp-tab-width:2;tab-size:var(--cbp-tab-width, 2)\"><pre class=\"shiki github-dark\" style=\"background-color: #24292e\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color: #B392F0\">tail<\/span><span style=\"color: #E1E4E8\"> <\/span><span style=\"color: #79B8FF\">-f<\/span><span style=\"color: #E1E4E8\"> <\/span><span style=\"color: #9ECBFF\">\/var\/log\/php-fpm\/www-error.log<\/span><\/span>\n<span class=\"line\"><span style=\"color: #6A737D\"># or for specific PHP version<\/span><\/span>\n<span class=\"line\"><span style=\"color: #B392F0\">tail<\/span><span style=\"color: #E1E4E8\"> <\/span><span style=\"color: #79B8FF\">-f<\/span><span style=\"color: #E1E4E8\"> <\/span><span style=\"color: #9ECBFF\">\/var\/log\/php8.3-fpm.log<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n<p>Look for the <code>reached max_children<\/code> warning and note the timestamp and pool name.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Monitor Current Resource Usage<\/h3>\n\n\n\n<p>Check memory usage of PHP-FPM processes:<\/p>\n\n\n\n<div class=\"wp-block-kevinbatdorf-code-block-pro\" data-code-block-pro-font-family=\"Code-Pro-JetBrains-Mono-NL.ttf\" style=\"font-size:clamp(16px, 1rem, 24px);font-family:Code-Pro-JetBrains-Mono-NL,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;line-height:clamp(26px, 1.625rem, 39px);--cbp-tab-width:2;tab-size:var(--cbp-tab-width, 2)\"><pre class=\"shiki github-dark\" style=\"background-color: #24292e\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color: #B392F0\">ps<\/span><span style=\"color: #E1E4E8\"> <\/span><span style=\"color: #79B8FF\">-ylC<\/span><span style=\"color: #E1E4E8\"> <\/span><span style=\"color: #9ECBFF\">php-fpm<\/span><span style=\"color: #E1E4E8\"> <\/span><span style=\"color: #79B8FF\">--sort:rss<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n<p>Or calculate average process size (in MB):<\/p>\n\n\n\n<div class=\"wp-block-kevinbatdorf-code-block-pro\" data-code-block-pro-font-family=\"Code-Pro-JetBrains-Mono-NL.ttf\" style=\"font-size:clamp(16px, 1rem, 24px);font-family:Code-Pro-JetBrains-Mono-NL,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;line-height:clamp(26px, 1.625rem, 39px);--cbp-tab-width:2;tab-size:var(--cbp-tab-width, 2)\"><pre class=\"shiki github-dark\" style=\"background-color: #24292e\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color: #B392F0\">ps<\/span><span style=\"color: #E1E4E8\"> <\/span><span style=\"color: #79B8FF\">-ylC<\/span><span style=\"color: #E1E4E8\"> <\/span><span style=\"color: #9ECBFF\">php-fpm<\/span><span style=\"color: #E1E4E8\"> <\/span><span style=\"color: #79B8FF\">--sort:rss<\/span><span style=\"color: #E1E4E8\"> <\/span><span style=\"color: #F97583\">|<\/span><span style=\"color: #E1E4E8\"> <\/span><span style=\"color: #B392F0\">awk<\/span><span style=\"color: #E1E4E8\"> <\/span><span style=\"color: #9ECBFF\">'{sum+=$8; ++n} END {print \"Avg=\"sum\/n\/1024\" MB\"}'<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n<p>Typical PHP worker size ranges from 30\u2013150 MB depending on your application (WordPress with many plugins can exceed 80\u2013100 MB).<\/p>\n\n\n\n<p>View overall system resources:<\/p>\n\n\n\n<div class=\"wp-block-kevinbatdorf-code-block-pro\" data-code-block-pro-font-family=\"Code-Pro-JetBrains-Mono-NL.ttf\" style=\"font-size:clamp(16px, 1rem, 24px);font-family:Code-Pro-JetBrains-Mono-NL,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;line-height:clamp(26px, 1.625rem, 39px);--cbp-tab-width:2;tab-size:var(--cbp-tab-width, 2)\"><pre class=\"shiki github-dark\" style=\"background-color: #24292e\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color: #B392F0\">free<\/span><span style=\"color: #E1E4E8\"> <\/span><span style=\"color: #79B8FF\">-h<\/span><\/span>\n<span class=\"line\"><span style=\"color: #B392F0\">htop<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n<p>Also check slow query logs in MySQL\/MariaDB and web server access logs for patterns.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Review Server Load and Traffic<\/h3>\n\n\n\n<p>Use tools like:<\/p>\n\n\n\n<div class=\"wp-block-kevinbatdorf-code-block-pro\" data-code-block-pro-font-family=\"Code-Pro-JetBrains-Mono-NL.ttf\" style=\"font-size:clamp(16px, 1rem, 24px);font-family:Code-Pro-JetBrains-Mono-NL,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;line-height:clamp(26px, 1.625rem, 39px);--cbp-tab-width:2;tab-size:var(--cbp-tab-width, 2)\"><pre class=\"shiki github-dark\" style=\"background-color: #24292e\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color: #B392F0\">top<\/span><\/span>\n<span class=\"line\"><span style=\"color: #B392F0\">netstat<\/span><span style=\"color: #E1E4E8\"> <\/span><span style=\"color: #79B8FF\">-tn<\/span><span style=\"color: #E1E4E8\"> <\/span><span style=\"color: #F97583\">|<\/span><span style=\"color: #E1E4E8\"> <\/span><span style=\"color: #B392F0\">grep<\/span><span style=\"color: #E1E4E8\"> <\/span><span style=\"color: #9ECBFF\">:80<\/span><span style=\"color: #E1E4E8\"> <\/span><span style=\"color: #F97583\">|<\/span><span style=\"color: #E1E4E8\"> <\/span><span style=\"color: #B392F0\">wc<\/span><span style=\"color: #E1E4E8\"> <\/span><span style=\"color: #79B8FF\">-l<\/span><span style=\"color: #E1E4E8\">   <\/span><span style=\"color: #6A737D\"># or :443<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n<p>For WordPress sites, review plugin performance and enable query monitoring.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Step 2: Calculate Safe pm.max_children Value<\/h2>\n\n\n\n<p>A reliable formula is:<\/p>\n\n\n\n<p><strong>Available RAM for PHP \u00f7 Average memory per PHP-FPM process<\/strong><\/p>\n\n\n\n<p><strong>Steps to calculate:<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list article_list\">\n<li>Determine total server RAM.<\/li>\n\n\n\n<li>Subtract RAM reserved for OS, web server, database (MySQL\/MariaDB typically 1\u20132 GB+), and other services.<\/li>\n\n\n\n<li>Leave a 10\u201320% safety buffer to avoid swapping\/OOM.<\/li>\n\n\n\n<li>Divide by the average RSS (Resident Set Size) of a PHP worker.<\/li>\n<\/ol>\n\n\n\n<p><strong>Example:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Server: 8 GB RAM<\/li>\n\n\n\n<li>Reserved: 1 GB (OS) + 2 GB (MySQL) = 3 GB<\/li>\n\n\n\n<li>Buffer: 10% of remaining (~0.5 GB)<\/li>\n\n\n\n<li>Net for PHP: ~4.5 GB (4608 MB)<\/li>\n\n\n\n<li>Average worker: 80 MB<\/li>\n\n\n\n<li><strong>pm.max_children \u2248 57<\/strong> (round down to 50\u201355 for safety)<\/li>\n<\/ul>\n\n\n\n<p>Always test changes gradually and monitor under load. For multiple sites\/pools, allocate RAM proportionally.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Step 3: Choose the Right Process Manager Mode<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>High-traffic single site<\/strong> \u2192 Use <strong>static<\/strong> for lowest latency.<\/li>\n\n\n\n<li><strong>Variable traffic or shared resources<\/strong> \u2192 Use <strong>dynamic<\/strong>.<\/li>\n\n\n\n<li><strong>Low-traffic or memory-constrained VPS<\/strong> \u2192 Use <strong>ondemand<\/strong>.<\/li>\n<\/ul>\n\n\n\n<p>Recommended starting values for <strong>dynamic<\/strong> mode (adjust based on calculation):<\/p>\n\n\n\n<div class=\"wp-block-kevinbatdorf-code-block-pro\" data-code-block-pro-font-family=\"Code-Pro-JetBrains-Mono-NL.ttf\" style=\"font-size:clamp(16px, 1rem, 24px);font-family:Code-Pro-JetBrains-Mono-NL,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;line-height:clamp(26px, 1.625rem, 39px);--cbp-tab-width:2;tab-size:var(--cbp-tab-width, 2)\"><pre class=\"shiki github-dark\" style=\"background-color: #24292e\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color: #F97583\">pm<\/span><span style=\"color: #E1E4E8\"> = dynamic<\/span><\/span>\n<span class=\"line\"><span style=\"color: #F97583\">pm.max_children<\/span><span style=\"color: #E1E4E8\"> = 50          <\/span><span style=\"color: #6A737D\">; Calculated value<\/span><\/span>\n<span class=\"line\"><span style=\"color: #F97583\">pm.start_servers<\/span><span style=\"color: #E1E4E8\"> = 15         <\/span><span style=\"color: #6A737D\">; ~25-30% of max_children<\/span><\/span>\n<span class=\"line\"><span style=\"color: #F97583\">pm.min_spare_servers<\/span><span style=\"color: #E1E4E8\"> = 10     <\/span><span style=\"color: #6A737D\">; ~20% of max_children<\/span><\/span>\n<span class=\"line\"><span style=\"color: #F97583\">pm.max_spare_servers<\/span><span style=\"color: #E1E4E8\"> = 30     <\/span><span style=\"color: #6A737D\">; ~60% of max_children<\/span><\/span>\n<span class=\"line\"><span style=\"color: #F97583\">pm.max_requests<\/span><span style=\"color: #E1E4E8\"> = 500         <\/span><span style=\"color: #6A737D\">; Restart workers after N requests (helps with leaks)<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n<p>For <strong>static<\/strong>:<\/p>\n\n\n\n<div class=\"wp-block-kevinbatdorf-code-block-pro\" data-code-block-pro-font-family=\"Code-Pro-JetBrains-Mono-NL.ttf\" style=\"font-size:clamp(16px, 1rem, 24px);font-family:Code-Pro-JetBrains-Mono-NL,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;line-height:clamp(26px, 1.625rem, 39px);--cbp-tab-width:2;tab-size:var(--cbp-tab-width, 2)\"><pre class=\"shiki github-dark\" style=\"background-color: #24292e\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color: #F97583\">pm<\/span><span style=\"color: #E1E4E8\"> = static<\/span><\/span>\n<span class=\"line\"><span style=\"color: #F97583\">pm.max_children<\/span><span style=\"color: #E1E4E8\"> = 50<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n<p>For <strong>ondemand<\/strong> (add <code>pm.process_idle_timeout = 10s<\/code>).<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Step 4: Edit PHP-FPM Configuration (InMotion Hosting \/ cPanel WHM)<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Using WHM MultiPHP Manager (Easiest for InMotion Users)<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Log in to <strong>WHM<\/strong> as root.<\/li>\n\n\n\n<li>Search for and open <strong>MultiPHP Manager<\/strong>.<\/li>\n\n\n\n<li>Go to the <strong>System PHP-FPM Settings<\/strong> tab (or per-version settings).<\/li>\n\n\n\n<li>Locate <strong>Max children<\/strong> and increase it to your calculated value.<\/li>\n\n\n\n<li>Save \/ Update the configuration.<\/li>\n<\/ol>\n\n\n\n<p>This method applies system-wide or per-PHP version changes.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"724\" src=\"https:\/\/www.inmotionhosting.com\/support\/wp-content\/uploads\/2019\/12\/multi-php-manager-1024x724.png\" alt=\"\" class=\"wp-image-50977\" srcset=\"https:\/\/www.inmotionhosting.com\/support\/wp-content\/uploads\/2019\/12\/multi-php-manager-1024x724.png 1024w, https:\/\/www.inmotionhosting.com\/support\/wp-content\/uploads\/2019\/12\/multi-php-manager-300x212.png 300w, https:\/\/www.inmotionhosting.com\/support\/wp-content\/uploads\/2019\/12\/multi-php-manager-768x543.png 768w, https:\/\/www.inmotionhosting.com\/support\/wp-content\/uploads\/2019\/12\/multi-php-manager.png 1135w\" sizes=\"auto, (min-width: 1360px) 876px, (min-width: 960px) calc(61.58vw + 51px), calc(100vw - 80px)\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Manual Edit (Advanced \/ Per-Pool)<\/h3>\n\n\n\n<p>Edit the pool configuration file (common locations):<\/p>\n\n\n\n<div class=\"wp-block-kevinbatdorf-code-block-pro\" data-code-block-pro-font-family=\"Code-Pro-JetBrains-Mono-NL.ttf\" style=\"font-size:clamp(16px, 1rem, 24px);font-family:Code-Pro-JetBrains-Mono-NL,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;line-height:clamp(26px, 1.625rem, 39px);--cbp-tab-width:2;tab-size:var(--cbp-tab-width, 2)\"><pre class=\"shiki github-dark\" style=\"background-color: #24292e\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color: #6A737D\"># cPanel-style<\/span><\/span>\n<span class=\"line\"><span style=\"color: #B392F0\">nano<\/span><span style=\"color: #E1E4E8\"> <\/span><span style=\"color: #9ECBFF\">\/opt\/cpanel\/ea-phpXX\/root\/etc\/php-fpm.d\/www.conf<\/span><\/span>\n<span class=\"line\"><span style=\"color: #6A737D\"># or<\/span><\/span>\n<span class=\"line\"><span style=\"color: #B392F0\">nano<\/span><span style=\"color: #E1E4E8\"> <\/span><span style=\"color: #9ECBFF\">\/etc\/php\/8.3\/fpm\/pool.d\/www.conf<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n<p>Apply the changes from Step 3. For per-domain overrides, edit the user-specific pool file if present.<\/p>\n\n\n\n<p>Set strict file permissions:<\/p>\n\n\n\n<div class=\"wp-block-kevinbatdorf-code-block-pro\" data-code-block-pro-font-family=\"Code-Pro-JetBrains-Mono-NL.ttf\" style=\"font-size:clamp(16px, 1rem, 24px);font-family:Code-Pro-JetBrains-Mono-NL,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;line-height:clamp(26px, 1.625rem, 39px);--cbp-tab-width:2;tab-size:var(--cbp-tab-width, 2)\"><pre class=\"shiki github-dark\" style=\"background-color: #24292e\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color: #B392F0\">chmod<\/span><span style=\"color: #E1E4E8\"> <\/span><span style=\"color: #79B8FF\">644<\/span><span style=\"color: #E1E4E8\"> <\/span><span style=\"color: #9ECBFF\">\/path\/to\/www.conf<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Step 5: Restart PHP-FPM and Verify<\/h2>\n\n\n\n<div class=\"wp-block-kevinbatdorf-code-block-pro\" data-code-block-pro-font-family=\"Code-Pro-JetBrains-Mono-NL.ttf\" style=\"font-size:clamp(16px, 1rem, 24px);font-family:Code-Pro-JetBrains-Mono-NL,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;line-height:clamp(26px, 1.625rem, 39px);--cbp-tab-width:2;tab-size:var(--cbp-tab-width, 2)\"><pre class=\"shiki github-dark\" style=\"background-color: #24292e\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color: #B392F0\">sudo<\/span><span style=\"color: #E1E4E8\"> <\/span><span style=\"color: #9ECBFF\">systemctl<\/span><span style=\"color: #E1E4E8\"> <\/span><span style=\"color: #9ECBFF\">restart<\/span><span style=\"color: #E1E4E8\"> <\/span><span style=\"color: #9ECBFF\">php-fpm<\/span><\/span>\n<span class=\"line\"><span style=\"color: #6A737D\"># or for specific version<\/span><\/span>\n<span class=\"line\"><span style=\"color: #B392F0\">sudo<\/span><span style=\"color: #E1E4E8\"> <\/span><span style=\"color: #9ECBFF\">systemctl<\/span><span style=\"color: #E1E4E8\"> <\/span><span style=\"color: #9ECBFF\">restart<\/span><span style=\"color: #E1E4E8\"> <\/span><span style=\"color: #9ECBFF\">php8.3-fpm<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n<p>On some systems the service name is <code>php-fpm<\/code> or <code>php-fpm.service<\/code>.<\/p>\n\n\n\n<p>Test the site under normal and simulated load. Monitor logs again:<\/p>\n\n\n\n<div class=\"wp-block-kevinbatdorf-code-block-pro\" data-code-block-pro-font-family=\"Code-Pro-JetBrains-Mono-NL.ttf\" style=\"font-size:clamp(16px, 1rem, 24px);font-family:Code-Pro-JetBrains-Mono-NL,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;line-height:clamp(26px, 1.625rem, 39px);--cbp-tab-width:2;tab-size:var(--cbp-tab-width, 2)\"><pre class=\"shiki github-dark\" style=\"background-color: #24292e\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color: #B392F0\">tail<\/span><span style=\"color: #E1E4E8\"> <\/span><span style=\"color: #79B8FF\">-f<\/span><span style=\"color: #E1E4E8\"> <\/span><span style=\"color: #9ECBFF\">\/var\/log\/php-fpm\/<\/span><span style=\"color: #79B8FF\">*<\/span><span style=\"color: #9ECBFF\">error.log<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n<p>Check status (if <code>pm.status_path<\/code> is enabled):<\/p>\n\n\n\n<div class=\"wp-block-kevinbatdorf-code-block-pro\" data-code-block-pro-font-family=\"Code-Pro-JetBrains-Mono-NL.ttf\" style=\"font-size:clamp(16px, 1rem, 24px);font-family:Code-Pro-JetBrains-Mono-NL,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;line-height:clamp(26px, 1.625rem, 39px);--cbp-tab-width:2;tab-size:var(--cbp-tab-width, 2)\"><pre class=\"shiki github-dark\" style=\"background-color: #24292e\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color: #B392F0\">curl<\/span><span style=\"color: #E1E4E8\"> <\/span><span style=\"color: #9ECBFF\">http:\/\/your-site\/status<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Additional Optimization Tips<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Enable and tune <strong>OPcache<\/strong> (opcode caching) in <code>php.ini<\/code>.<\/li>\n\n\n\n<li>Implement <strong>Redis<\/strong> or Memcached for object caching.<\/li>\n\n\n\n<li>Use a full-page caching plugin\/solution (e.g., for WordPress).<\/li>\n\n\n\n<li>Optimize database queries and code; fix slow scripts.<\/li>\n\n\n\n<li>Consider NGINX + PHP-FPM for better performance over Apache.<\/li>\n\n\n\n<li>Set <code>pm.max_requests<\/code> to recycle workers periodically and mitigate memory leaks.<\/li>\n\n\n\n<li>Monitor with tools like New Relic, Munin, or <code>htop<\/code> after changes.<\/li>\n<\/ul>\n\n\n\n<p>If you run multiple sites, create separate pools with tailored limits instead of one large shared pool.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">When to Contact Support<\/h2>\n\n\n\n<p>If increasing <code>pm.max_children<\/code> causes swapping, OOM errors, or the issue persists:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Your server may need more RAM\/CPU.<\/li>\n\n\n\n<li>There could be underlying code or plugin problems.<\/li>\n\n\n\n<li>InMotion Hosting customers should open a support ticket with log excerpts and <code>free -h<\/code> output.<\/li>\n<\/ul>\n\n\n\n<p>Properly tuned PHP-FPM eliminates the <code>max_children<\/code> error, improves response times, and prevents unnecessary server strain. Start conservatively, test thoroughly, and scale based on real traffic patterns. For InMotion UltraStack or custom VPS setups, these adjustments provide significant performance gains while maintaining stability.<\/p>\n\n\n\n<p>If you are unsure of the proper value, contact our <a href=\"https:\/\/www.inmotionhosting.com\/support\/amp\/how-to-get-great-technical-support\/\">live technical support team or submit a support ticket<\/a>. You can also <a aria-label=\" find articles and guides on PHP-FPM (opens in a new tab)\" href=\"https:\/\/www.inmotionhosting.com\/support\/server\/php-fpm\/\" target=\"_blank\" rel=\"noreferrer noopener\">find articles and guides on PHP-FPM<\/a> and  <a href=\"https:\/\/www.inmotionhosting.com\/support\/edu\/wordpress\/optimize-wordpress\/\">WordPress Stack Optimization Guide: Tuning for VPS &amp; Dedicated Servers<\/a> in the InMotion Hosting Support website.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The PHP-FPM &#8220;server reached max_children&#8221; warning is a common performance issue on VPS and dedicated servers using PHP-FPM (FastCGI Process Manager). It appears in the PHP-FPM error log when the pool has exhausted all available child processes and cannot handle new incoming PHP requests. This often results in slow page loads, 502\/504 Gateway Timeout errors<a class=\"moretag\" href=\"https:\/\/www.inmotionhosting.com\/support\/server\/php-fpm\/fix-max-children-error\/\"> Read More ><\/a><\/p>\n","protected":false},"author":56983,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[4449],"tags":[],"class_list":["post-50972","post","type-post","status-publish","format-standard","hentry","category-php-fpm"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Fix the PHP-FPM &quot;server reached max_children&quot; Error<\/title>\n<meta name=\"description\" content=\"Learn how to fix the PHP-FPM &quot;server reached max_children&quot; error by adjusting the values for max_children.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.inmotionhosting.com\/support\/server\/php-fpm\/fix-max-children-error\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Fix Reached Max_Children Error with PHP-FPM Server\" \/>\n<meta property=\"og:description\" content=\"Learn how to fix the Reached Max_Children error in PHP-FPM. This article will teach how to adjust the values for max children.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.inmotionhosting.com\/support\/server\/php-fpm\/fix-max-children-error\/\" \/>\n<meta property=\"og:site_name\" content=\"InMotion Hosting Support Center\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/inmotionhosting\/\" \/>\n<meta property=\"article:published_time\" content=\"2026-04-15T22:28:07+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-04-15T22:36:42+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.inmotionhosting.com\/support\/wp-content\/uploads\/2021\/06\/php-fpm-reached.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"630\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Carrie Smaha\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@carriesmaha\" \/>\n<meta name=\"twitter:site\" content=\"@InMotionHosting\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Carrie Smaha\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.inmotionhosting.com\/support\/server\/php-fpm\/fix-max-children-error\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.inmotionhosting.com\/support\/server\/php-fpm\/fix-max-children-error\/\"},\"author\":{\"name\":\"Carrie Smaha\",\"@id\":\"https:\/\/www.inmotionhosting.com\/support\/#\/schema\/person\/595948dab2995d347a87076abdae19d8\"},\"headline\":\"How to Fix the PHP-FPM &#8220;server reached max_children&#8221; 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