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Add instructions to increase PHP's default memory_limit #156

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May 13, 2022
Merged

Add instructions to increase PHP's default memory_limit #156

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29 changes: 28 additions & 1 deletion docs/best-practices/deployment.md
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Original file line number Diff line number Diff line change
Expand Up @@ -277,6 +277,32 @@ or `[::]` IPv6 address like this:
$ X_LISTEN=0.0.0.0:8080 php public/index.php
```

### Memory limit

X is carefully designed to minimize memory usage. Depending on your application
workload, it may need anywhere from a few kilobytes to a couple of megabytes per
request. Once the request is completely handled, used memory will be freed again.
Under load spikes, memory may temporarily increase to handle concurrent requests.
PHP can handle this load just fine, but many default setups use a rather low
memory limit that is more suited for single requests only.

```
Fatal error: Allowed memory size of 134217728 bytes exhausted […]
```

When using the built-in web server, we highly recommend increasing the memory
limit to match your concurrency workload. On Ubuntu- or Debian-based systems,
you may change your PHP configuration like this:

```bash
$ sudoedit /etc/php/8.1/cli/php.ini
```

```diff title="/etc/php/8.1/cli/php.ini"
- memory_limit = 128M
+ memory_limit = -1
```

### Systemd

So far, we're manually executing the application server on the command line and
Expand Down Expand Up @@ -513,7 +539,8 @@ be achieved by using a `Dockerfile` with the following contents:
&& pecl install ev \
&& docker-php-ext-enable ev \
&& docker-php-ext-install sockets \
&& apk del ${PHPIZE_DEPS}
&& apk del ${PHPIZE_DEPS} \
&& echo "memory_limit = -1" >> "$PHP_INI_DIR/conf.d/acme.ini"

WORKDIR /app/
COPY public/ public/
Expand Down
3 changes: 2 additions & 1 deletion tests/Dockerfile-production
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Expand Up @@ -15,7 +15,8 @@ RUN apk --no-cache add ${PHPIZE_DEPS} libev \
&& pecl install ev \
&& docker-php-ext-enable ev \
&& docker-php-ext-install sockets \
&& apk del ${PHPIZE_DEPS}
&& apk del ${PHPIZE_DEPS} \
&& echo "memory_limit = -1" >> "$PHP_INI_DIR/conf.d/acme.ini"

WORKDIR /app/
COPY public/ public/
Expand Down