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# Implements system state sampling. Called by buildstats.bbclass.
# Because it is a real Python module, it can hold persistent state,
# like open log files and the time of the last sampling.
import time
class SystemStats:
def __init__(self, d):
bn = d.getVar('BUILDNAME', True)
bsdir = os.path.join(d.getVar('BUILDSTATS_BASE', True), bn)
bb.utils.mkdirhier(bsdir)
self.proc_files = []
for filename in ('diskstats', 'meminfo', 'stat'):
# In practice, this class gets instantiated only once in
# the bitbake cooker process. Therefore 'append' mode is
# not strictly necessary, but using it makes the class
# more robust should two processes ever write
# concurrently.
self.proc_files.append((filename,
open(os.path.join(bsdir, 'proc_%s.log' % filename), 'ab')))
# Last time that we sampled data.
self.last = 0
# Minimum number of seconds between recording a sample. This
# becames relevant when we get called very often while many
# short tasks get started. Sampling during quiet periods
# depends on the heartbeat event, which fires less often.
self.min_seconds = 1
def close(self):
self.monitor_disk.close()
for _, output, _ in self.proc_files:
output.close()
def sample(self, force):
now = time.time()
if (now - self.last > self.min_seconds) or force:
for filename, output in self.proc_files:
with open(os.path.join('/proc', filename), 'rb') as input:
data = input.read()
# Unbuffered raw write, less overhead and useful
# in case that we end up with concurrent writes.
os.write(output.fileno(),
('%.0f\n' % now).encode('ascii') +
data +
b'\n')
self.last = now
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