Prometheus Java Client Benchmarks

Run Information

• Date: 2026-08-19T03:56:52Z
• Commit: c8e2c03
• JDK: 25.0.3 (OpenJDK 64-Bit Server VM)
• Benchmark config: 3 fork(s), 3 warmup, 5 measurement, 4 threads
• Hardware: AMD EPYC 7763 64-Core Processor, 4 cores, 16 GB RAM
• OS: Linux 6.17.0-1022-azure

Results for PR head

CounterBenchmark

Benchmark	Score	Error	Units	Within run
prometheusInc	65.45K	± 725.92	ops/s	fastest
prometheusNoLabelsInc	56.39K	± 1.10K	ops/s	1.2x slower
codahaleIncNoLabels	48.25K	± 1.52K	ops/s	1.4x slower
prometheusAdd	48.21K	± 4.95K	ops/s	1.4x slower
openTelemetryIncNoLabels	18.54K	± 76.89	ops/s	3.5x slower
openTelemetryInc	14.21K	± 729.46	ops/s	4.6x slower
openTelemetryAdd	12.75K	± 360.03	ops/s	5.1x slower
simpleclientInc	6.60K	± 85.40	ops/s	9.9x slower
simpleclientAdd	6.44K	± 27.73	ops/s	10x slower
simpleclientNoLabelsInc	6.35K	± 36.66	ops/s	10x slower

HistogramBenchmark

Benchmark	Score	Error	Units	Within run
prometheusClassicPerThread	12.29K	± 41.05	ops/s	fastest
prometheusClassic	6.05K	± 1.79K	ops/s	2.0x slower
prometheusClassicSingleThread	4.57K	± 45.13	ops/s	2.7x slower
simpleclient	4.44K	± 42.33	ops/s	2.8x slower
prometheusNative	2.98K	± 269.22	ops/s	4.1x slower
openTelemetryClassic	796.21	± 23.00	ops/s	15x slower
openTelemetryExponential	767.93	± 174.03	ops/s	16x slower

HistogramTextFormatBenchmark

Benchmark	Score	Error	Units	Within run
prometheusWriteToNull	24.17K	± 384.06	ops/s	fastest
openMetricsWriteToNull	23.59K	± 1.13K	ops/s	1.0x slower

TextFormatUtilBenchmark

Benchmark	Score	Error	Units	Within run
prometheusWriteToNull	502.61K	± 2.20K	ops/s	fastest
prometheusWriteToByteArray	495.77K	± 4.81K	ops/s	1.0x slower
openMetricsWriteToNull	484.94K	± 2.56K	ops/s	1.0x slower
openMetricsWriteToByteArray	477.89K	± 3.24K	ops/s	1.1x slower

Raw Results

Benchmark                                            Mode  Cnt          Score        Error  Units
CounterBenchmark.codahaleIncNoLabels                thrpt   15      48246.185   ± 1521.542  ops/s
CounterBenchmark.openTelemetryAdd                   thrpt   15      12753.069    ± 360.034  ops/s
CounterBenchmark.openTelemetryInc                   thrpt   15      14214.523    ± 729.464  ops/s
CounterBenchmark.openTelemetryIncNoLabels           thrpt   15      18537.061     ± 76.892  ops/s
CounterBenchmark.prometheusAdd                      thrpt   15      48208.219   ± 4954.709  ops/s
CounterBenchmark.prometheusInc                      thrpt   15      65446.224    ± 725.924  ops/s
CounterBenchmark.prometheusNoLabelsInc              thrpt   15      56386.494   ± 1101.961  ops/s
CounterBenchmark.simpleclientAdd                    thrpt   15       6439.590     ± 27.733  ops/s
CounterBenchmark.simpleclientInc                    thrpt   15       6596.331     ± 85.400  ops/s
CounterBenchmark.simpleclientNoLabelsInc            thrpt   15       6353.114     ± 36.661  ops/s
HistogramBenchmark.openTelemetryClassic             thrpt   15        796.214     ± 22.997  ops/s
HistogramBenchmark.openTelemetryExponential         thrpt   15        767.926    ± 174.029  ops/s
HistogramBenchmark.prometheusClassic                thrpt   15       6047.072   ± 1790.090  ops/s
HistogramBenchmark.prometheusClassicPerThread       thrpt   15      12292.857     ± 41.048  ops/s
HistogramBenchmark.prometheusClassicSingleThread    thrpt   15       4567.046     ± 45.126  ops/s
HistogramBenchmark.prometheusNative                 thrpt   15       2980.421    ± 269.217  ops/s
HistogramBenchmark.simpleclient                     thrpt   15       4441.234     ± 42.326  ops/s
HistogramTextFormatBenchmark.openMetricsWriteToNull  thrpt   15      23586.182   ± 1134.361  ops/s
HistogramTextFormatBenchmark.prometheusWriteToNull  thrpt   15      24171.609    ± 384.058  ops/s
TextFormatUtilBenchmark.openMetricsWriteToByteArray  thrpt   15     477893.205   ± 3235.450  ops/s
TextFormatUtilBenchmark.openMetricsWriteToNull      thrpt   15     484935.789   ± 2559.521  ops/s
TextFormatUtilBenchmark.prometheusWriteToByteArray  thrpt   15     495766.560   ± 4809.775  ops/s
TextFormatUtilBenchmark.prometheusWriteToNull       thrpt   15     502610.295   ± 2200.113  ops/s

Notes

• Score = Throughput in operations per second (higher is better)
• Error = 99.9% confidence interval
• Within run compares benchmarks in the same result set, not against the base commit.

Benchmark Descriptions

Benchmark	Description
CounterBenchmark	Counter increment performance: Prometheus, OpenTelemetry, simpleclient, Codahale
HistogramBenchmark	Histogram observation performance (classic vs native/exponential)
TextFormatUtilBenchmark	Metric exposition format writing speed