From 8f475b78c9dbcd861784b3f06511bedb6d43f2ca Mon Sep 17 00:00:00 2001 From: Patrick Ohly Date: Wed, 30 Nov 2016 10:50:01 +0100 Subject: buildstats: add system state sampling /proc/[diskstats|meminfo|stat] get sampled and written to the same proc_.log files as during normal bootchat logging. This will allow rendering the CPU, disk and memory usage charts. Right now sampling happens once a second, triggered by the heartbeat event.That produces quite a bit of data for long builds, which will be addressed in a separate commit by storing the data in a more compact form. (From OE-Core rev: 6f4e8180b5b4857eaf6caf410fd3a4a41ed85930) Signed-off-by: Patrick Ohly Signed-off-by: Ross Burton Signed-off-by: Richard Purdie --- meta/lib/buildstats.py | 47 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) create mode 100644 meta/lib/buildstats.py (limited to 'meta/lib/buildstats.py') diff --git a/meta/lib/buildstats.py b/meta/lib/buildstats.py new file mode 100644 index 0000000000..8ce4112c2d --- /dev/null +++ b/meta/lib/buildstats.py @@ -0,0 +1,47 @@ +# 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 -- cgit v1.2.3-54-g00ecf