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Transfer of execution data through socket should use buffered stream by Godin · Pull Request #2089 · jacoco/jacoco · GitHub
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Transfer of execution data through socket should use buffered stream - #2089

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Godin merged 9 commits into
jacoco:masterfrom
Godin:BufferedSocket
Jun 4, 2026
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Transfer of execution data through socket should use buffered stream#2089
Godin merged 9 commits into
jacoco:masterfrom
Godin:BufferedSocket

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@Godin Godin commented Mar 26, 2026 •
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While working on #2073 I noticed that

  • socket.getOutputStream() is not wrapped into BufferedOutputStream when writing execution data
  • socket.getInputStream() is not wrapped into BufferedInputStream when reading execution data

Seems that this always been like that since version 0.4.0 that 16 years ago introduced remote dumps via TCP/IP connections.

Corresponding change for EclEmma - eclipse-eclemma/eclemma#130

For the record here is results from my machine of benchmark added in this PR when executed on JDK 25:

Benchmark                                    (benchmarkSide)  (bufferedReceiver)  (bufferedSender)  (dataSize)     (dataType)  Mode  Cnt   Score   Error  Units
CompactDataThroughSocketBenchmark.benchmark           SENDER                true              true          32         STRING  avgt   10   0.052 ± 0.003  us/op
CompactDataThroughSocketBenchmark.benchmark           SENDER                true              true         128         STRING  avgt   10   0.147 ± 0.013  us/op
CompactDataThroughSocketBenchmark.benchmark           SENDER                true              true        1024         STRING  avgt   10   1.286 ± 0.101  us/op
CompactDataThroughSocketBenchmark.benchmark           SENDER                true              true          32  BOOLEAN_ARRAY  avgt   10   0.031 ± 0.001  us/op
CompactDataThroughSocketBenchmark.benchmark           SENDER                true              true         128  BOOLEAN_ARRAY  avgt   10   0.119 ± 0.004  us/op
CompactDataThroughSocketBenchmark.benchmark           SENDER                true              true        1024  BOOLEAN_ARRAY  avgt   10   0.845 ± 0.041  us/op

CompactDataThroughSocketBenchmark.benchmark           SENDER                true             false          32         STRING  avgt   10   0.729 ± 0.009  us/op
CompactDataThroughSocketBenchmark.benchmark           SENDER                true             false         128         STRING  avgt   10   0.943 ± 0.048  us/op
CompactDataThroughSocketBenchmark.benchmark           SENDER                true             false        1024         STRING  avgt   10   1.713 ± 0.025  us/op
CompactDataThroughSocketBenchmark.benchmark           SENDER                true             false          32  BOOLEAN_ARRAY  avgt   10   3.275 ± 0.045  us/op
CompactDataThroughSocketBenchmark.benchmark           SENDER                true             false         128  BOOLEAN_ARRAY  avgt   10  11.783 ± 0.212  us/op
CompactDataThroughSocketBenchmark.benchmark           SENDER                true             false        1024  BOOLEAN_ARRAY  avgt   10  85.378 ± 1.166  us/op

CompactDataThroughSocketBenchmark.benchmark           SENDER               false              true          32         STRING  avgt   10   0.703 ± 0.010  us/op
CompactDataThroughSocketBenchmark.benchmark           SENDER               false              true         128         STRING  avgt   10   0.843 ± 0.011  us/op
CompactDataThroughSocketBenchmark.benchmark           SENDER               false              true        1024         STRING  avgt   10   1.863 ± 0.011  us/op
CompactDataThroughSocketBenchmark.benchmark           SENDER               false              true          32  BOOLEAN_ARRAY  avgt   10   1.496 ± 0.022  us/op
CompactDataThroughSocketBenchmark.benchmark           SENDER               false              true         128  BOOLEAN_ARRAY  avgt   10   5.231 ± 0.107  us/op
CompactDataThroughSocketBenchmark.benchmark           SENDER               false              true        1024  BOOLEAN_ARRAY  avgt   10  38.525 ± 0.655  us/op

CompactDataThroughSocketBenchmark.benchmark           SENDER               false             false          32         STRING  avgt   10   0.891 ± 0.042  us/op
CompactDataThroughSocketBenchmark.benchmark           SENDER               false             false         128         STRING  avgt   10   1.077 ± 0.073  us/op
CompactDataThroughSocketBenchmark.benchmark           SENDER               false             false        1024         STRING  avgt   10   1.672 ± 0.074  us/op
CompactDataThroughSocketBenchmark.benchmark           SENDER               false             false          32  BOOLEAN_ARRAY  avgt   10   3.434 ± 0.039  us/op
CompactDataThroughSocketBenchmark.benchmark           SENDER               false             false         128  BOOLEAN_ARRAY  avgt   10  11.991 ± 0.210  us/op
CompactDataThroughSocketBenchmark.benchmark           SENDER               false             false        1024  BOOLEAN_ARRAY  avgt   10  91.538 ± 7.731  us/op

CompactDataThroughSocketBenchmark.benchmark         RECEIVER                true              true          32         STRING  avgt   10   0.054 ± 0.002  us/op
CompactDataThroughSocketBenchmark.benchmark         RECEIVER                true              true         128         STRING  avgt   10   0.143 ± 0.002  us/op
CompactDataThroughSocketBenchmark.benchmark         RECEIVER                true              true        1024         STRING  avgt   10   1.285 ± 0.222  us/op
CompactDataThroughSocketBenchmark.benchmark         RECEIVER                true              true          32  BOOLEAN_ARRAY  avgt   10   0.029 ± 0.002  us/op
CompactDataThroughSocketBenchmark.benchmark         RECEIVER                true              true         128  BOOLEAN_ARRAY  avgt   10   0.115 ± 0.006  us/op
CompactDataThroughSocketBenchmark.benchmark         RECEIVER                true              true        1024  BOOLEAN_ARRAY  avgt   10   0.825 ± 0.022  us/op

CompactDataThroughSocketBenchmark.benchmark         RECEIVER                true             false          32         STRING  avgt   10   0.738 ± 0.023  us/op
CompactDataThroughSocketBenchmark.benchmark         RECEIVER                true             false         128         STRING  avgt   10   0.882 ± 0.029  us/op
CompactDataThroughSocketBenchmark.benchmark         RECEIVER                true             false        1024         STRING  avgt   10   1.698 ± 0.037  us/op
CompactDataThroughSocketBenchmark.benchmark         RECEIVER                true             false          32  BOOLEAN_ARRAY  avgt   10   3.181 ± 0.077  us/op
CompactDataThroughSocketBenchmark.benchmark         RECEIVER                true             false         128  BOOLEAN_ARRAY  avgt   10  11.605 ± 0.216  us/op
CompactDataThroughSocketBenchmark.benchmark         RECEIVER                true             false        1024  BOOLEAN_ARRAY  avgt   10  84.648 ± 1.607  us/op

CompactDataThroughSocketBenchmark.benchmark         RECEIVER               false              true          32         STRING  avgt   10   0.697 ± 0.028  us/op
CompactDataThroughSocketBenchmark.benchmark         RECEIVER               false              true         128         STRING  avgt   10   0.810 ± 0.017  us/op
CompactDataThroughSocketBenchmark.benchmark         RECEIVER               false              true        1024         STRING  avgt   10   1.729 ± 0.109  us/op
CompactDataThroughSocketBenchmark.benchmark         RECEIVER               false              true          32  BOOLEAN_ARRAY  avgt   10   1.526 ± 0.055  us/op
CompactDataThroughSocketBenchmark.benchmark         RECEIVER               false              true         128  BOOLEAN_ARRAY  avgt   10   5.251 ± 0.229  us/op
CompactDataThroughSocketBenchmark.benchmark         RECEIVER               false              true        1024  BOOLEAN_ARRAY  avgt   10  37.466 ± 0.832  us/op

CompactDataThroughSocketBenchmark.benchmark         RECEIVER               false             false          32         STRING  avgt   10   0.889 ± 0.038  us/op
CompactDataThroughSocketBenchmark.benchmark         RECEIVER               false             false         128         STRING  avgt   10   1.031 ± 0.067  us/op
CompactDataThroughSocketBenchmark.benchmark         RECEIVER               false             false        1024         STRING  avgt   10   1.768 ± 0.116  us/op
CompactDataThroughSocketBenchmark.benchmark         RECEIVER               false             false          32  BOOLEAN_ARRAY  avgt   10   3.281 ± 0.147  us/op
CompactDataThroughSocketBenchmark.benchmark         RECEIVER               false             false         128  BOOLEAN_ARRAY  avgt   10  12.009 ± 0.269  us/op
CompactDataThroughSocketBenchmark.benchmark         RECEIVER               false             false        1024  BOOLEAN_ARRAY  avgt   10  86.965 ± 3.639  us/op
  • apply suggestions from code review
  • update examples
  • update javadocs of RemoteControlWriter and RemoteControlReader constructors
  • update changelog

@Godin Godin self-assigned this Mar 26, 2026
@Godin Godin added this to the 0.8.15 milestone Mar 26, 2026
@Godin
Godin force-pushed the BufferedSocket branch 2 times, most recently from eb3fc14 to af2cc36 Compare March 26, 2026 22:58
@Godin Godin mentioned this pull request Mar 26, 2026
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@Godin
Godin requested a review from marchof March 26, 2026 23:04
marchof
marchof reviewed Mar 31, 2026
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Comment thread org.jacoco.core/src/org/jacoco/core/tools/ExecDumpClient.java Resolved
marchof
marchof reviewed Mar 31, 2026
View reviewed changes
Comment thread org.jacoco.agent.rt/src/org/jacoco/agent/rt/internal/output/TcpConnection.java Resolved
This was referenced Mar 31, 2026
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@Godin
Godin force-pushed the BufferedSocket branch 4 times, most recently from 9b97e0b to 93919a9 Compare June 4, 2026 08:01
@Godin
Godin marked this pull request as ready for review June 4, 2026 19:34
@Godin
Godin enabled auto-merge (squash) June 4, 2026 19:35
@Godin
Godin merged commit 5c05141 into jacoco:master Jun 4, 2026
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@Godin
Godin deleted the BufferedSocket branch June 4, 2026 19:41
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