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authorPatrick Ohly <patrick.ohly@intel.com>2016-11-30 10:50:01 +0100
committerRichard Purdie <richard.purdie@linuxfoundation.org>2016-12-07 10:36:10 +0000
commit6f4e8180b5b4857eaf6caf410fd3a4a41ed85930 (patch)
tree44c3010a817fe49347d03b9f7a84c74a8c423e3a /meta/lib/buildstats.py
parent5cc5cdc788308a79f8f0706e6d794c602ef427ed (diff)
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buildstats: add system state sampling
/proc/[diskstats|meminfo|stat] get sampled and written to the same proc_<filename>.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. Signed-off-by: Patrick Ohly <patrick.ohly@intel.com> Signed-off-by: Ross Burton <ross.burton@intel.com>
Diffstat (limited to 'meta/lib/buildstats.py')
-rw-r--r--meta/lib/buildstats.py47
1 files changed, 47 insertions, 0 deletions
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
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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