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Merged
tigrannajaryan merged 1 commit into from
Jan 7, 2026
Merged

Eliminate unnecessary nextChunk logic during reading #302

tigrannajaryan merged 1 commit into from
Jan 7, 2026

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@tigrannajaryan tigrannajaryan commented Dec 18, 2025

nextChunk was a remnant from old logic that is no longer used. The current code does not try to read past current frame bytes and there is no need for the logic that loads the next chunk.

Renamed chunkedReader to limitedReader for more clarity and added a unit test.

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github-actions bot commented Dec 18, 2025 •
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Benchmark Result

Benchmark diff with base branch 
goos: linux
goarch: amd64
pkg: github.com/splunk/stef/benchmarks
cpu: AMD EPYC 7763 64-Core Processor                
                                                 │ bench-main.txt │           bench-new.txt            │
                                                 │     sec/op     │    sec/op     vs base              │
SerializeNative/STEF/serialize-4                     13.11m ±  3%   12.98m ±  2%       ~ (p=0.937 n=6)
SerializeNative/STEFU/serialize-4                    35.43m ±  1%   35.55m ±  1%       ~ (p=0.240 n=6)
DeserializeNative/STEF/deser-4                       2.561m ±  1%   2.562m ±  3%       ~ (p=0.818 n=6)
DeserializeNative/STEFU/deser-4                      7.357m ±  1%   7.365m ±  0%       ~ (p=0.485 n=6)
SerializeFromPdata/STEF/serialize-4                  147.9m ±  3%   141.6m ±  6%  -4.28% (p=0.026 n=6)
SerializeFromPdata/STEFU/serialize-4                 35.92m ±  1%   35.74m ±  1%  -0.51% (p=0.009 n=6)
DeserializeToPdata/STEF/deserialize-4                45.65m ±  2%   45.76m ±  2%       ~ (p=0.589 n=6)
DeserializeToPdata/STEFU/deserialize-4               63.04m ±  1%   63.70m ±  1%  +1.06% (p=0.041 n=6)
STEFReaderRead-4                                     2.614m ±  2%   2.628m ±  2%       ~ (p=0.699 n=6)
STEFSerializeMultipart/astronomy-otelmetrics-4        3.700 ± 17%    3.648 ± 19%       ~ (p=0.818 n=6)
STEFDeserializeMultipart/astronomy-otelmetrics-4     80.23m ± 11%   73.43m ± 15%       ~ (p=0.937 n=6)
ReadSTEF-4                                           2.779m ±  1%   2.721m ±  4%       ~ (p=0.065 n=6)
ReadSTEFZ-4                                          3.751m ±  3%   3.486m ±  3%  -7.06% (p=0.002 n=6)
ReadSTEFZWriteSTEF-4                                 8.727m ±  2%   8.033m ±  4%  -7.95% (p=0.002 n=6)
geomean                                              22.67m         22.16m        -2.23%

                                                 │ bench-main.txt │           bench-new.txt            │
                                                 │   sec/point    │  sec/point    vs base              │
SerializeNative/STEF/serialize-4                     196.1n ±  3%   194.2n ±  2%       ~ (p=0.937 n=6)
SerializeNative/STEFU/serialize-4                    529.8n ±  1%   531.7n ±  1%       ~ (p=0.240 n=6)
DeserializeNative/STEF/deser-4                       38.31n ±  1%   38.31n ±  3%       ~ (p=0.818 n=6)
DeserializeNative/STEFU/deser-4                      110.0n ±  1%   110.1n ±  0%       ~ (p=0.457 n=6)
SerializeFromPdata/STEF/serialize-4                  2.213µ ±  3%   2.119µ ±  6%  -4.25% (p=0.017 n=6)
SerializeFromPdata/STEFU/serialize-4                 537.2n ±  1%   534.6n ±  1%  -0.49% (p=0.011 n=6)
DeserializeToPdata/STEF/deserialize-4                682.9n ±  2%   684.6n ±  2%       ~ (p=0.589 n=6)
DeserializeToPdata/STEFU/deserialize-4               942.9n ±  1%   952.9n ±  1%  +1.06% (p=0.041 n=6)
STEFReaderRead-4                                     39.10n ±  2%   39.31n ±  2%       ~ (p=0.699 n=6)
STEFSerializeMultipart/astronomy-otelmetrics-4       4.702µ ± 17%   4.637µ ± 19%       ~ (p=0.818 n=6)
STEFDeserializeMultipart/astronomy-otelmetrics-4    102.00n ± 11%   93.32n ± 15%       ~ (p=0.937 n=6)
ReadSTEF-4                                           41.59n ±  1%   40.72n ±  4%       ~ (p=0.058 n=6)
ReadSTEFZ-4                                          56.14n ±  3%   52.17n ±  3%  -7.06% (p=0.002 n=6)
ReadSTEFZWriteSTEF-4                                 130.6n ±  2%   120.2n ±  4%  -7.92% (p=0.002 n=6)
geomean                                              238.4n         233.1n        -2.23%

                                                 │ bench-main.txt │           bench-new.txt            │
                                                 │      B/op      │     B/op      vs base              │
SerializeNative/STEF/serialize-4                     3.349Mi ± 0%   3.349Mi ± 0%       ~ (p=0.937 n=6)
SerializeNative/STEFU/serialize-4                    7.530Mi ± 0%   7.530Mi ± 0%       ~ (p=1.000 n=6)
DeserializeNative/STEF/deser-4                       934.4Ki ± 0%   934.4Ki ± 0%  -0.00% (p=0.002 n=6)
DeserializeNative/STEFU/deser-4                      1.471Mi ± 0%   1.471Mi ± 0%  -0.00% (p=0.002 n=6)
SerializeFromPdata/STEF/serialize-4                  74.82Mi ± 0%   74.82Mi ± 0%       ~ (p=0.089 n=6)
SerializeFromPdata/STEFU/serialize-4                 7.530Mi ± 0%   7.530Mi ± 0%       ~ (p=0.513 n=6)
DeserializeToPdata/STEF/deserialize-4                31.97Mi ± 0%   31.97Mi ± 0%  -0.00% (p=0.002 n=6)
DeserializeToPdata/STEFU/deserialize-4               38.64Mi ± 0%   38.64Mi ± 0%  -0.00% (p=0.002 n=6)
STEFReaderRead-4                                     936.2Ki ± 0%   936.2Ki ± 0%  -0.00% (p=0.002 n=6)
STEFSerializeMultipart/astronomy-otelmetrics-4       3.362Gi ± 0%   3.362Gi ± 0%       ~ (p=0.937 n=6)
STEFDeserializeMultipart/astronomy-otelmetrics-4     20.59Mi ± 0%   20.59Mi ± 0%  -0.00% (p=0.035 n=6)
ReadSTEF-4                                           936.2Ki ± 0%   936.2Ki ± 0%  -0.00% (p=0.002 n=6)
ReadSTEFZ-4                                          10.27Mi ± 0%   10.27Mi ± 0%       ~ (p=0.881 n=6)
ReadSTEFZWriteSTEF-4                                 13.43Mi ± 0%   13.43Mi ± 0%  -0.00% (p=0.013 n=6)
geomean                                              10.48Mi        10.48Mi       +0.00%

                                                 │ bench-main.txt │            bench-new.txt            │
                                                 │   allocs/op    │  allocs/op   vs base                │
SerializeNative/STEF/serialize-4                      2.667k ± 1%   2.667k ± 0%       ~ (p=0.656 n=6)
SerializeNative/STEFU/serialize-4                      885.0 ± 0%    885.0 ± 0%       ~ (p=1.000 n=6)
DeserializeNative/STEF/deser-4                         465.0 ± 0%    464.0 ± 0%  -0.22% (p=0.002 n=6)
DeserializeNative/STEFU/deser-4                        469.0 ± 0%    468.0 ± 0%  -0.21% (p=0.002 n=6)
SerializeFromPdata/STEF/serialize-4                   134.7k ± 0%   134.7k ± 0%       ~ (p=1.000 n=6)
SerializeFromPdata/STEFU/serialize-4                   886.0 ± 0%    886.0 ± 0%       ~ (p=1.000 n=6) ¹
DeserializeToPdata/STEF/deserialize-4                 756.2k ± 0%   756.2k ± 0%       ~ (p=0.152 n=6)
DeserializeToPdata/STEFU/deserialize-4                944.9k ± 0%   944.9k ± 0%  -0.00% (p=0.002 n=6)
STEFReaderRead-4                                       465.0 ± 0%    464.0 ± 0%  -0.22% (p=0.002 n=6)
STEFSerializeMultipart/astronomy-otelmetrics-4        13.15M ± 0%   13.15M ± 0%       ~ (p=0.589 n=6)
STEFDeserializeMultipart/astronomy-otelmetrics-4      2.296k ± 0%   2.294k ± 0%  -0.07% (p=0.009 n=6)
ReadSTEF-4                                             466.0 ± 0%    465.0 ± 0%  -0.21% (p=0.002 n=6)
ReadSTEFZ-4                                            504.0 ± 0%    503.0 ± 0%  -0.20% (p=0.002 n=6)
ReadSTEFZWriteSTEF-4                                  1.234k ± 0%   1.233k ± 0%  -0.08% (p=0.002 n=6)
geomean                                               6.364k        6.358k       -0.09%
¹ all samples are equal
Benchmark result 
benchstat bench-new.txt
goos: linux
goarch: amd64
pkg: github.com/splunk/stef/benchmarks
cpu: AMD EPYC 7763 64-Core Processor                
                                                 │ bench-new.txt │
                                                 │    sec/op     │
SerializeNative/STEF/serialize-4                    12.98m ±  2%
SerializeNative/STEFU/serialize-4                   35.55m ±  1%
DeserializeNative/STEF/deser-4                      2.562m ±  3%
DeserializeNative/STEFU/deser-4                     7.365m ±  0%
SerializeFromPdata/STEF/serialize-4                 141.6m ±  6%
SerializeFromPdata/STEFU/serialize-4                35.74m ±  1%
DeserializeToPdata/STEF/deserialize-4               45.76m ±  2%
DeserializeToPdata/STEFU/deserialize-4              63.70m ±  1%
STEFReaderRead-4                                    2.628m ±  2%
STEFSerializeMultipart/astronomy-otelmetrics-4       3.648 ± 19%
STEFDeserializeMultipart/astronomy-otelmetrics-4    73.43m ± 15%
ReadSTEF-4                                          2.721m ±  4%
ReadSTEFZ-4                                         3.486m ±  3%
ReadSTEFZWriteSTEF-4                                8.033m ±  4%
geomean                                             22.16m

                                                 │ bench-new.txt │
                                                 │   sec/point   │
SerializeNative/STEF/serialize-4                    194.2n ±  2%
SerializeNative/STEFU/serialize-4                   531.7n ±  1%
DeserializeNative/STEF/deser-4                      38.31n ±  3%
DeserializeNative/STEFU/deser-4                     110.1n ±  0%
SerializeFromPdata/STEF/serialize-4                 2.119µ ±  6%
SerializeFromPdata/STEFU/serialize-4                534.6n ±  1%
DeserializeToPdata/STEF/deserialize-4               684.6n ±  2%
DeserializeToPdata/STEFU/deserialize-4              952.9n ±  1%
STEFReaderRead-4                                    39.31n ±  2%
STEFSerializeMultipart/astronomy-otelmetrics-4      4.637µ ± 19%
STEFDeserializeMultipart/astronomy-otelmetrics-4    93.32n ± 15%
ReadSTEF-4                                          40.72n ±  4%
ReadSTEFZ-4                                         52.17n ±  3%
ReadSTEFZWriteSTEF-4                                120.2n ±  4%
geomean                                             233.1n

                                                 │ bench-new.txt │
                                                 │     B/op      │
SerializeNative/STEF/serialize-4                    3.349Mi ± 0%
SerializeNative/STEFU/serialize-4                   7.530Mi ± 0%
DeserializeNative/STEF/deser-4                      934.4Ki ± 0%
DeserializeNative/STEFU/deser-4                     1.471Mi ± 0%
SerializeFromPdata/STEF/serialize-4                 74.82Mi ± 0%
SerializeFromPdata/STEFU/serialize-4                7.530Mi ± 0%
DeserializeToPdata/STEF/deserialize-4               31.97Mi ± 0%
DeserializeToPdata/STEFU/deserialize-4              38.64Mi ± 0%
STEFReaderRead-4                                    936.2Ki ± 0%
STEFSerializeMultipart/astronomy-otelmetrics-4      3.362Gi ± 0%
STEFDeserializeMultipart/astronomy-otelmetrics-4    20.59Mi ± 0%
ReadSTEF-4                                          936.2Ki ± 0%
ReadSTEFZ-4                                         10.27Mi ± 0%
ReadSTEFZWriteSTEF-4                                13.43Mi ± 0%
geomean                                             10.48Mi

                                                 │ bench-new.txt │
                                                 │   allocs/op   │
SerializeNative/STEF/serialize-4                     2.667k ± 0%
SerializeNative/STEFU/serialize-4                     885.0 ± 0%
DeserializeNative/STEF/deser-4                        464.0 ± 0%
DeserializeNative/STEFU/deser-4                       468.0 ± 0%
SerializeFromPdata/STEF/serialize-4                  134.7k ± 0%
SerializeFromPdata/STEFU/serialize-4                  886.0 ± 0%
DeserializeToPdata/STEF/deserialize-4                756.2k ± 0%
DeserializeToPdata/STEFU/deserialize-4               944.9k ± 0%
STEFReaderRead-4                                      464.0 ± 0%
STEFSerializeMultipart/astronomy-otelmetrics-4       13.15M ± 0%
STEFDeserializeMultipart/astronomy-otelmetrics-4     2.294k ± 0%
ReadSTEF-4                                            465.0 ± 0%
ReadSTEFZ-4                                           503.0 ± 0%
ReadSTEFZWriteSTEF-4                                 1.233k ± 0%
geomean                                              6.358k

@tigrannajaryan tigrannajaryan marked this pull request as ready for review December 18, 2025 23:08
@tigrannajaryan tigrannajaryan force-pushed the tigran/fix-bugs-fuzfound branch from 6196f52 to c1096ad Compare December 19, 2025 05:13
@tigrannajaryan tigrannajaryan force-pushed the tigran/fix-chunk-reader branch from 03e2d9d to 5e36e54 Compare December 19, 2025 05:17
@tigrannajaryan tigrannajaryan force-pushed the tigran/fix-bugs-fuzfound branch 2 times, most recently from 19ac1c3 to c4a7629 Compare January 7, 2026 19:50
Base automatically changed from tigran/fix-bugs-fuzfound to main January 7, 2026 19:59
@tigrannajaryan
Eliminate unnecessary nextChunk logic during reading
45a63f2 
nextChunk was a remnant from old logic that is no longer used.
The current code does not try to read past current frame bytes and
there is no need for the logic that loads the next chunk.

Renamed chunkedReader to limitedReader for more clarity and added
a unit test.
@tigrannajaryan tigrannajaryan force-pushed the tigran/fix-chunk-reader branch from 5e36e54 to 45a63f2 Compare January 7, 2026 20:02
@tigrannajaryan tigrannajaryan merged commit be1c640 into main Jan 7, 2026
9 checks passed
@tigrannajaryan tigrannajaryan deleted the tigran/fix-chunk-reader branch January 7, 2026 20:12
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@abhisheksplunk abhisheksplunk abhisheksplunk approved these changes

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