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from __future__ import unicode_literals
try:
import resource
except ImportError:
pass # Will fail on Win32 systems
import time
from django.template.loader import render_to_string
from django.utils.translation import ugettext as _
from debug_toolbar.panels import DebugPanel
class TimerDebugPanel(DebugPanel):
"""
Panel that displays the time a response took in milliseconds.
"""
name = 'Timer'
template = 'debug_toolbar/panels/timer.html'
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):
stats = {'total_time': (time.time() - self._start_time) * 1000}
if self.has_resource:
self._end_rusage = resource.getrusage(resource.RUSAGE_SELF)
stats['utime'] = 1000 * self._elapsed_ru('ru_utime')
stats['stime'] = 1000 * self._elapsed_ru('ru_stime')
stats['total'] = stats['utime'] + stats['stime']
stats['vcsw'] = self._elapsed_ru('ru_nvcsw')
stats['ivcsw'] = self._elapsed_ru('ru_nivcsw')
stats['minflt'] = self._elapsed_ru('ru_minflt')
stats['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. :-(
#
# stats['blkin'] = self._elapsed_ru('ru_inblock')
# stats['blkout'] = self._elapsed_ru('ru_oublock')
# stats['swap'] = self._elapsed_ru('ru_nswap')
# stats['rss'] = self._end_rusage.ru_maxrss
# stats['srss'] = self._end_rusage.ru_ixrss
# stats['urss'] = self._end_rusage.ru_idrss
# stats['usrss'] = self._end_rusage.ru_isrss
self.record_stats(stats)
def nav_title(self):
return _('Time')
def nav_subtitle(self):
stats = self.get_stats()
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: %(cum)0.2fms (%(total)0.2fms)') % {
'cum': (utime + stime) * 1000.0,
'total': stats['total_time']
}
else:
return _('TOTAL: %0.2fms') % stats['total_time']
def title(self):
return _('Time')
def _elapsed_ru(self, name):
return getattr(self._end_rusage, name) - getattr(self._start_rusage, name)
def content(self):
stats = self.get_stats()
rows = (
(_('User CPU time'), _('%(utime)0.3f msec') % stats),
(_('System CPU time'), _('%(stime)0.3f msec') % stats),
(_('Total CPU time'), _('%(total)0.3f msec') % stats),
(_('Elapsed time'), _('%(total_time)0.3f msec') % stats),
(_('Context switches'), _('%(vcsw)d voluntary, %(ivcsw)d involuntary') % stats),
)
context = self.context.copy()
context.update({'rows': rows})
return render_to_string(self.template, context)
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