Apache + PHP performance tuning #64
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…manual overrides as global vars * if no manual override, calculating php memory_limit via `shell` task * replacing apache default prefork config with include to separate file * generating prefork.conf from template (incl calculated directive values) * using custom `replace` module, see ansible/ansible#4889 Fixes #56
| {% set apache_max_spare_servers = 10 if ansible_memtotal_mb >= 2048 else 3 %} | ||
| {%- endif -%} | ||
| {%- if apache_max_requests_per_child is undefined -%} | ||
| {% set apache_max_requests_per_child = 1000 %} |
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Note: as this has little to do with physical machine specs and more to do with bandwidth usage, I figured we can just plug in a sensible default value.
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Confirmed expected behavior for: Slightly unexpected behavior for: At a guess, I think there's something off in the php |
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Fixed for machines with > 2GB |
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If there are no objections (pokes @ericclemmons), I'm planning to merge this for 0.2.29 |
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Lots to go over here, but the only potential BC issue I'd have is with variable naming. Would it make sense to have groups, like seen here?
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Here's an interesting pitfall: the vars defined in a role (eg, the So yeah...something to be aware of |
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Oh, another one! If ansible finds two conflicting groups (python dicts under the hood), it replaces them rather than merging them. # With this in $REPO/provisioning/group_vars/webservers...
php_settings:
memory_limit: 320
# And this in $REPO/bower_components/genesis-wordpress/provisioning/roles/wordpress/vars/main.yml...
php_settings:
date_timezone: America/Chicago
# We end up losing the nested vars from group_vars. SURPRISE!
php_settings:
date_timezone: America/Chicago |
…ng settings from roles/wordpress/vars Note that template logic in prefork.conf is necessarily more complex (as we cannot assign to dicts), but also somewhat more explicit and less magical. I'm okay with this.
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Confirmed expected behavior: |
Apache + PHP performance tuning
Php's memory_limit is calculated in a
commandtask, and the rest are calculated in atemplateof an apache include (implemented using a customreplacemodule that's currently a PR for ansible core; see ansible/ansible#4889).The following global vars can be specified as manual overrides for above calculations:
php_settings.memory_limitreserved_memory.mysqlreserved_memory.systemapache_settings.start_serversapache_settings.min_spare_serversapache_settings.max_spare_serversapache_settings.max_clientsapache_settings.max_requests_per_childFixes #56