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try:
import resource
except ImportError:
pass # Will fail on Win32 systems
import time
from django.template.loader import render_to_string
from debug_toolbar.panels import DebugPanel
class TimerDebugPanel(DebugPanel):
"""
Panel that displays the time a response took in milliseconds.
"""
name = 'Timer'
try: # if resource module not available, don't show content panel
resource
except NameError:
has_content = False
has_resource = False
else:
has_content = True
has_resource = True
def process_request(self, request):
self._start_time = time.time()
if self.has_resource:
self._start_rusage = resource.getrusage(resource.RUSAGE_SELF)
def process_response(self, request, response):
self.total_time = (time.time() - self._start_time) * 1000
if self.has_resource:
self._end_rusage = resource.getrusage(resource.RUSAGE_SELF)
def title(self):
return 'Time'
def subtitle(self):
if self.has_resource:
utime = self._end_rusage.ru_utime - self._start_rusage.ru_utime
stime = self._end_rusage.ru_stime - self._start_rusage.ru_stime
return 'CPU: %0.2fms (%0.2fms)' % ((utime + stime) * 1000.0, self.total_time)
else:
return 'TOTAL: %0.2fms' % (self.total_time)
def url(self):
return ''
def _elapsed_ru(self, name):
return getattr(self._end_rusage, name) - getattr(self._start_rusage, name)
def content(self):
utime = 1000 * self._elapsed_ru('ru_utime')
stime = 1000 * self._elapsed_ru('ru_stime')
vcsw = self._elapsed_ru('ru_nvcsw')
ivcsw = self._elapsed_ru('ru_nivcsw')
minflt = self._elapsed_ru('ru_minflt')
majflt = self._elapsed_ru('ru_majflt')
# these are documented as not meaningful under Linux. If you're running BSD
# feel free to enable them, and add any others that I hadn't gotten to before
# I noticed that I was getting nothing but zeroes and that the docs agreed. :-(
#
# blkin = self._elapsed_ru('ru_inblock')
# blkout = self._elapsed_ru('ru_oublock')
# swap = self._elapsed_ru('ru_nswap')
# rss = self._end_rusage.ru_maxrss
# srss = self._end_rusage.ru_ixrss
# urss = self._end_rusage.ru_idrss
# usrss = self._end_rusage.ru_isrss
rows = (
('User CPU time', '%0.3f msec' % utime),
('System CPU time', '%0.3f msec' % stime),
('Total CPU time', '%0.3f msec' % (utime + stime)),
('Elapsed time', '%0.3f msec' % self.total_time),
('Context switches', '%d voluntary, %d involuntary' % (vcsw, ivcsw)),
# ('Memory use', '%d max RSS, %d shared, %d unshared' % (rss, srss, urss + usrss)),
# ('Page faults', '%d no i/o, %d requiring i/o' % (minflt, majflt)),
# ('Disk operations', '%d in, %d out, %d swapout' % (blkin, blkout, swap)),
)
context = {
'rows': rows,
}
return render_to_string('debug_toolbar/panels/timer.html', context)
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