Commit Graph

78 Commits

Author SHA1 Message Date
Bjoern Rabenstein 9da2fbcce3 Eliminate a number of style-guide violations.
Change-Id: Iedcd611e5c7ad24c84c004d8d6c551d1734e443c
2014-04-25 21:18:04 +02:00
Bjoern Rabenstein 00816363e4 Remove the one duplication of the Tester interface.
Change-Id: Ie17ec3393a7e12e0f27e51b4060aa478a172f612
2014-04-25 20:51:08 +02:00
Bjoern Rabenstein e5dc0421cd Move signature.go and related tests to the model package.
The LabelsToSignature function is now used outside of the prometheus
package, too. Leaving it in the prometheuos package is misleading
design and will lead to circulat import chains soon.

Change-Id: If1ca442d4023b33b138cf79fee68e82ff2a355be
2014-04-25 20:48:16 +02:00
Bjoern Rabenstein 46fc7a3748 Support the new protobuf fields.
- Full support for UNTYPED type.

- Receptive support for timestamp_ms (i.e. the processor can process
  it, but the client library cannot yet create it - which is kind of
  intended as timestamps are meant for other things like federation,
  which will need separate support anyway).

Change-Id: I5913164a80089943d49ad58bf86e465a843ab82b
2014-04-22 15:11:34 +02:00
Bjoern Rabenstein ecac33bed0 Conversion back and forth between MetricFamily protobuf and text format.
The idea here is to always go via the protobufs if dealing with the
text format. That won't always be the most efficient way, but it
avoids the multiplicity of conversion routines required for direct
conversion (e.g. text format -> internal representation in the
Prometheus server). The loss of efficiency is acceptable because the
text format should not be used in high performance (high throughput,
low latency) situations anyway.

In that way, the text format stays perfectly isolated from other parts
of the code. To receive text format, just plug the conversion in
before the code path that normally reads protobufs. Correspondingly,
for sending text format, simply replace the WriteDelimited call by a
text.Create call.

Nevertheless, the conversion code itself is optimized for efficiency
and minimized memory churn (which was one of the reason for handcoding
the parser and not using a lexer/parser code generation tool).

Change-Id: Iee45ffe8aa421a844225d13a1f859becd8a3b066
2014-04-17 16:28:13 +02:00
Matt T. Proud e782194166 Fix lock semantics on Summary#Reset.
This erroneously used the read lock as opposed to the write lock.

Change-Id: Ib127f8c117a516709eff9fd927603879501089b4
2014-04-15 01:49:28 +02:00
Matt T. Proud 7efd34a6f8 Optimize fingerprinting and metric locks.
These are all simple changes we should have caught a long time ago:

1. The hashing mechanism for fingerprint label sets should have not
   allocated new objects for the actual hashing---at least not
   egregiously.  This simplifies the hash writing by just byte-
   dumping the string stream into the hasher.

2. The hashing mechanism within the scope of a metric does not care
   about the value of the label keys themselves but only of the label
   values.  The keys can be dropped from the calculation.

3. The locking mechanism for the metrics should not block on hash
   computation but rather solely on the actual mutation or critical
   section reads.

4. For scalar metrics (i.e., ones with niladic label signatures), we
   should rely on a preallocated map versus requesting a new one
   ad hoc.

This is tested with Go 1.1, so the results may yield other values
for us elsewhere:

BEFORE
BenchmarkLabelValuesToSignatureScalar	500000000	         3.97 ns/op	       0 B/op	       0 allocs/op
BenchmarkLabelValuesToSignatureSingle	 5000000	       714 ns/op	      74 B/op	       4 allocs/op
BenchmarkLabelValuesToSignatureDouble	 1000000	      1153 ns/op	     107 B/op	       5 allocs/op
BenchmarkLabelValuesToSignatureTriple	 1000000	      1588 ns/op	     138 B/op	       6 allocs/op
BenchmarkLabelToSignatureScalar	500000000	         3.91 ns/op	       0 B/op	       0 allocs/op
BenchmarkLabelToSignatureSingle	 2000000	       874 ns/op	      92 B/op	       5 allocs/op
BenchmarkLabelToSignatureDouble	 1000000	      1528 ns/op	     139 B/op	       7 allocs/op
BenchmarkLabelToSignatureTriple	 1000000	      2172 ns/op	     186 B/op	       9 allocs/op

AFTER
BenchmarkLabelValuesToSignatureScalar	500000000	         4.36 ns/op	       0 B/op	       0 allocs/op
BenchmarkLabelValuesToSignatureSingle	 5000000	       378 ns/op	      89 B/op	       4 allocs/op
BenchmarkLabelValuesToSignatureDouble	 5000000	       574 ns/op	     142 B/op	       5 allocs/op
BenchmarkLabelValuesToSignatureTriple	 5000000	       758 ns/op	     186 B/op	       6 allocs/op
BenchmarkLabelToSignatureScalar	500000000	         4.06 ns/op	       0 B/op	       0 allocs/op
BenchmarkLabelToSignatureSingle	 5000000	       472 ns/op	     106 B/op	       5 allocs/op
BenchmarkLabelToSignatureDouble	 2000000	       746 ns/op	     174 B/op	       7 allocs/op
BenchmarkLabelToSignatureTriple	 1000000	      1061 ns/op	     235 B/op	       9 allocs/op

In effect, a single metric mutation operation's lookup overhead will
move from Before::iBenchmarkLabelToSignature to
After::BenchmarkLabelValuesToSignature.  This MINIMALLY reduces
1/2 the overhead.  I would be hesitant in reading the memory
allocation statistics, for this was run with the GC still on and
thusly inaccurate per Go benchmarking documentation.

Before::BenchmarkLabelValuesToSignature never existed, so it is not
of any intrinsic value in itself.  That said, the cases that still
rely on LabelToSignature experience consistently a 1/2 drop in time.

Change-Id: Ifc9e69f718af65a59f5be8117473518233258159
2014-04-14 19:06:09 +02:00
Bjoern Rabenstein b83e1b7cad Remove redundant __name__ label from protobuf output.
Change-Id: I72d5dbccb0325d6edf7abe5bca88dc5a6001029c
2014-04-03 15:18:12 +02:00
Bjoern Rabenstein ee34486fa1 Add a low-level MetricFamily injection hook.
This hook is needed for the upcoming push gateway.

Also remove go vet warnings and add test for Handler().

Change-Id: If6c56676c7a0f10c16b4effae7285903f8267616
2014-04-02 19:41:44 +02:00
Julius Volz bb957bc145 Change internal metric name label to __name__.
This also adds a check that forbids any user-supplied metrics to start
with the reserved label name prefix "__".

Change-Id: I2fe94c740b685ad05c4c670613cf2af7b9e1c1c0
2014-03-14 12:28:25 +01:00
Bernerd Schaefer 29ebb580db Add Reset(map[string]string) to Metric interface
Change-Id: I289cf8796adbd6ff55f23bba7730145329de00e1
2014-02-19 15:18:16 +01:00
Bernerd Schaefer ad41ea8439 Merge "Cache signature of an empty label set" 2013-09-16 12:56:13 +02:00
Bernerd Schaefer 26ad852c94 Cache signature of an empty label set
This is an optimization of labelsToSignature to avoid excess allocations
when the label set is empty.

Change-Id: If2d59bbc3ae6d4457e2ded197b6f4e7c67e6a173
2013-09-11 17:41:07 +02:00
Bernerd Schaefer a9b3602cea Register copies the provided baseLabels
This ensures that you can pass the same base label set into multiple
Register() calls, e.g.:

    labels := map[string]string{"key": "value"}
    prometheus.Register("metric_1", "", labels, ...)
    prometheus.Register("metric_2", "", labels, ...)

Change-Id: I951e5c2ed7844c74eb3716d1bf07126ce558f266
2013-09-11 17:38:00 +02:00
Matt T. Proud 93130ba5c3 Introduce histogram purging support. 2013-07-21 17:45:57 +02:00
Matt T. Proud a10d055c32 Include sample count and sum in Proto output. 2013-07-21 17:45:57 +02:00
Matt T. Proud 624e57d292 Enclose artifact generation process into Makefile.
Completely decouple the build process from Travis and other things we
cannot control.
2013-07-21 17:45:53 +02:00
Matt T. Proud 4956aea5ac Protocol Buffer negotiation support in handler. 2013-07-01 17:14:58 +02:00
Matt T. Proud 10dae5d108 Include relevant server model artifacts.
This commit introduces all relevant server-side artifacts such that the
Result streams can be used by external parties for one-off tools and
such.  This will ultimately better enable us to support additional
wireformats with much more ease.
2013-06-11 11:45:21 +02:00
Matt T. Proud 85899b3f4a Extract core Prometheus value decoders.
Bernerd had suggested extracting the value decoders and bundling them
into the client library.  After some reflection, I tend to agree with
this, since we can start breaking the onion of Prometheus itself and
localize the protocol management into its own scope.

A couple of major changes since moving:

- Protocol 0.0.2 has moved to a struct{} so that our tests can perform
  value matching, which cannot be done against function literals.

- Processing now acquires options to dictate behavioral changes of
  metrics bodies.

- Processing no longer closes the stream, thusly returning this to the
  hands of the caller.

- Process() has been renamed to ProcessSingle to better convey that it
  works on complete message bodies.  This paves the way for better
  streaming payload support that the next API version will offer.
2013-06-10 19:35:41 +02:00
Bernerd Schaefer af56a93a80 Rename test helper files to helpers_test.go
This ensures that these files are properly included only in testing.

[Fixes #10]
2013-05-06 11:13:44 +02:00
Bernerd Schaefer d4ff2cc87a Fix race conditions in metric methods
Methods which expect to use a mutex must be defined for the pointer
value, because mutexes are not copyable.
2013-05-03 16:02:03 +02:00
Bernerd Schaefer f60c783b29 Adhere to telemetry schema 0.0.2
* The schema and version of telemetry data is exposed through the
  Content-Type header instead of through a custom HTTP Header.

See [Prometheus Client Data Exposition Format][1] for more details.

[1]: https://docs.google.com/a/soundcloud.com/document/d/1ZjyKiKxZV83VI9ZKAXRGKaUKK2BIWCT7oiGBKDBpjEY/edit#heading=h.wnviarbnyxcj
2013-04-25 17:43:03 +02:00
Bernerd Schaefer 71dd60e431 Registry and Metrics implement json.Marshaler
* Drop `AsMarshallable()` from the Metric interface. Use
  `json.Marshaler` and `MarshalJSON()`, and leverage JSON struct tags
  where possible.

* Add `MarshalJSON()` to Registry and remove `dumpToWriter`, which
  makes the registry handler much simpler.

In addition to simplifying some of the marshalling behavior, this also
has the nice side effect of cutting down the number of
`map[string]interface{}` instances.
2013-04-19 15:07:24 +02:00
Bernerd Schaefer 3433b798b3 Use raw string literals in tests 2013-04-19 15:04:07 +02:00
Bernerd Schaefer 0b30e065c8 Metrics explicitly implement Metric interface 2013-04-19 15:04:07 +02:00
Bernerd Schaefer 9fccb96989 Remove timer.go and timer_test.go 2013-04-19 14:44:15 +02:00
Matt T. Proud f320d28a6c Rearrange file and package per convention.
WIP - Please review but do not merge.
2013-04-04 15:27:09 +02:00