arhibot / python-bem

Render BEMJSON with python and PyV8

Render BEMHTML templates using PyV8.

'www' based on code from https://github.com/bem/bem-bl-test.git

python-bem's Issues

Memory leaks when evaluating JS code

Hi, this is more PyV8 issue, but I want to know your experience.

After rendering js file (about 300kb) and exiting context, PyV8 doesn't free memory. This is code demonstration.

import os, gc
import PyV8
def get_mem():
    a = os.popen('ps -p %d -o %s | tail -1' % (os.getpid(),"vsize,rss,pcpu")).read()
    a = a.split()
    return (int(a[0]), int(a[1]))

def main():
    js_code = open('bem/touch.bundles/rubric/rubric.xml.js', 'r').read().decode('utf-8')

    for i in xrange(10**5):
        with PyV8.JSContext() as ctx:
            ctx.eval(js_code)
        if i % 10000:
            PyV8.JSEngine.collect()
            gc.collect()
            print get_mem()

if __name__ == "__main__":
    main()

Output:

(744060, 20432)
(745880, 21792)
(746904, 22268)
(746904, 22572)
...
(2176496, 1061752)
(2176496, 1062116)
Traceback (most recent call last):
  File "v8test.py", line 22, in <module>
    main()
  File "v8test.py", line 15, in main
    ctx.eval(js_code)
PyV8.JSError: JSError: <CALL_AND_RETRY_LAST> Allocation failed - process out of memory

Do you use python-bem in production?
Do you have such problem?
Does PyV8 leak with django object?
Which version of PyV8, V8 do you use?

Thank you in advance for any help.