Track PHP memory usage from command line

Question

I can use both ini_set('memory_limit', '512M'); in the file and php -d memory_limit=512M from the command line, but can also trace memory usage from terminal?

I know I can use memory_get_usage() inside a PHP file, but how to trace it from the command line?

@Justinas If I'll add watch -n 1 I will see how usage is changing while during the runtime. Is there a better way to find out? — Łukasz D. Tulikowski
– Łukasz D. Tulikowski, Commented Aug 4, 2020 at 8:38
php -r "var_dump(memory_get_usage());" will not help you, because it Returns the amount of memory allocated to PHP. You need to pass true as parameter to see the real used memory. — Markus Zeller
– Markus Zeller, Commented Aug 4, 2020 at 9:40

MiraTech · Accepted Answer · 2020-08-04 10:01:45Z

1

Try:

$ watch -n 5 'php -r "var_dump(memory_get_usage());"'

This will watch every 5 seconds the memory state

Or may be you can use the 'ps' tool:

$ ps -F -C php-cgi

Output:

UID        PID  PPID  C    SZ   RSS PSR STIME TTY          TIME CMD
http     10794 10786  0  4073   228   0 Jun09 ?        00:00:00 /usr/bin/php-cgi

RSS is the Real-memory (resident set) size in kilobytes of the process.

answered Aug 4, 2020 at 10:01

MiraTech

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1 Comment

Łukasz D. Tulikowski Over a year ago

I think this solution is more robust one than mine

Łukasz D. Tulikowski · Accepted Answer · 2020-08-09 04:36:28Z

0

The solution I was looking for with a simple output is

watch -n 5 'php -r "echo (string) memory_get_usage(true)/pow(10, 6);"'

Will return how many MB the PHP process is using.

2.097152

NOTICE: Solution like ps -F -C php-cgi on macOS machines will fail with

ps: illegal option -- F

answered Aug 9, 2020 at 4:36

Łukasz D. Tulikowski

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