Terminate processes if they grow too large
Plack::Middleware::SizeLimit - Terminate processes if they grow too large
use Plack::Builder;
builder {
enable SizeLimit => (
max_unshared_size_in_kb => '4096', # 4MB
# min_shared_size_in_kb => '8192', # 8MB
# max_process_size_in_kb => '16384', # 16MB
check_every_n_requests => 2
);
$app;
};
This middleware is a port of the excellent Apache::SizeLimit module
for multi-process Plack servers, such as Starman, Starlet and uWSGI.
This middleware only works when the environment psgix.harakiri is
set to a true value by the Plack server. If it’s set to false, then this
middleware simply does nothing.
You must use at least version 0.2006 of Starman, and 0.19 of Starlet. Earlier versions
ignore the flag to stop the process.
max_unshared_size_in_kb
The maximum amount of unshared memory the process can use;
usually this option is all one needs.
Experience on one heavily trafficked mod_perl site showed that
setting this option and leaving the others unset is the most effective
policy.
This is because it only kills off processes that are truly using too much
physical RAM, allowing most processes to live longer and reducing the
process churn rate.
min_shared_size_in_kb
Sets the minimum amount of shared memory the process must have.
max_process_size_in_kb
The maximum size of the process, including both shared and unshared memory.
check_every_n_requests
Since checking the process size can take a few system calls on some
platforms (e.g. linux), you may specify this option to check the process
size every N requests.
log_when_limits_exceeded
When true, a warning will be logged when it kills off a process.
To the extent possible under law, 唐鳳 has waived all copyright and related
or neighboring rights to Plack::Middleware::SizeLimit.
This work is published from Taiwan.