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Eliminate unnecessary nextChunk logic during reading #302

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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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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                     8.483m ± 23%   8.253m ±  6%       ~ (p=0.310 n=6)
SerializeNative/STEFU/serialize-4                    34.74m ±  1%   35.09m ±  1%  +0.99% (p=0.026 n=6)
DeserializeNative/STEF/deser-4                       2.394m ±  1%   2.407m ±  1%       ~ (p=0.093 n=6)
DeserializeNative/STEFU/deser-4                      7.239m ±  2%   7.175m ±  1%       ~ (p=0.394 n=6)
SerializeFromPdata/STEF/serialize-4                  132.3m ±  2%   132.7m ±  2%       ~ (p=0.937 n=6)
SerializeFromPdata/STEFU/serialize-4                 34.14m ±  2%   35.04m ±  2%  +2.63% (p=0.002 n=6)
DeserializeToPdata/STEF/deserialize-4                45.89m ±  2%   46.27m ±  2%       ~ (p=0.310 n=6)
DeserializeToPdata/STEFU/deserialize-4               62.63m ±  2%   62.72m ±  1%       ~ (p=1.000 n=6)
STEFReaderRead-4                                     2.449m ±  2%   2.483m ±  1%       ~ (p=0.065 n=6)
STEFSerializeMultipart/astronomy-otelmetrics-4        3.258 ± 22%    3.300 ± 23%       ~ (p=0.485 n=6)
STEFDeserializeMultipart/astronomy-otelmetrics-4     76.69m ±  9%   78.45m ± 11%       ~ (p=0.394 n=6)
ReadSTEF-4                                           2.448m ±  3%   2.451m ±  4%       ~ (p=0.699 n=6)
ReadSTEFZ-4                                          3.128m ±  4%   3.137m ±  2%       ~ (p=0.132 n=6)
ReadSTEFZWriteSTEF-4                                 7.393m ±  2%   7.340m ±  1%  -0.72% (p=0.041 n=6)
geomean                                              20.49m         20.58m        +0.46%

                                                 │ bench-main.txt │           bench-new.txt            │
                                                 │   sec/point    │  sec/point    vs base              │
SerializeNative/STEF/serialize-4                     126.9n ± 23%   123.5n ±  6%       ~ (p=0.290 n=6)
SerializeNative/STEFU/serialize-4                    519.7n ±  1%   524.8n ±  1%  +0.99% (p=0.024 n=6)
DeserializeNative/STEF/deser-4                       35.81n ±  1%   36.01n ±  1%       ~ (p=0.093 n=6)
DeserializeNative/STEFU/deser-4                      108.3n ±  2%   107.3n ±  1%       ~ (p=0.361 n=6)
SerializeFromPdata/STEF/serialize-4                  1.979µ ±  2%   1.985µ ±  2%       ~ (p=0.905 n=6)
SerializeFromPdata/STEFU/serialize-4                 510.7n ±  2%   524.1n ±  2%  +2.61% (p=0.002 n=6)
DeserializeToPdata/STEF/deserialize-4                686.5n ±  2%   692.1n ±  2%       ~ (p=0.258 n=6)
DeserializeToPdata/STEFU/deserialize-4               937.0n ±  2%   938.2n ±  1%       ~ (p=1.000 n=6)
STEFReaderRead-4                                     36.62n ±  2%   37.14n ±  1%       ~ (p=0.065 n=6)
STEFSerializeMultipart/astronomy-otelmetrics-4       4.141µ ± 22%   4.194µ ± 23%       ~ (p=0.485 n=6)
STEFDeserializeMultipart/astronomy-otelmetrics-4     97.48n ±  9%   99.72n ± 11%       ~ (p=0.394 n=6)
ReadSTEF-4                                           36.64n ±  3%   36.68n ±  4%       ~ (p=0.619 n=6)
ReadSTEFZ-4                                          46.82n ±  4%   46.95n ±  2%       ~ (p=0.128 n=6)
ReadSTEFZWriteSTEF-4                                 110.6n ±  2%   109.8n ±  1%  -0.72% (p=0.039 n=6)
geomean                                              215.5n         216.5n        +0.45%

                                                 │ bench-main.txt │           bench-new.txt            │
                                                 │      B/op      │     B/op      vs base              │
SerializeNative/STEF/serialize-4                     3.343Mi ± 0%   3.339Mi ± 0%       ~ (p=0.180 n=6)
SerializeNative/STEFU/serialize-4                    7.530Mi ± 0%   7.530Mi ± 0%       ~ (p=0.242 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=0.853 n=6)
SerializeFromPdata/STEFU/serialize-4                 7.530Mi ± 0%   7.530Mi ± 0%       ~ (p=0.186 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=1.000 n=6)
STEFDeserializeMultipart/astronomy-otelmetrics-4     20.59Mi ± 0%   20.59Mi ± 0%       ~ (p=0.589 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%  -0.00% (p=0.009 n=6)
ReadSTEFZWriteSTEF-4                                 13.43Mi ± 0%   13.43Mi ± 0%       ~ (p=0.219 n=6)
geomean                                              10.48Mi        10.48Mi       -0.01%

                                                 │ bench-main.txt │           bench-new.txt           │
                                                 │   allocs/op    │  allocs/op   vs base              │
SerializeNative/STEF/serialize-4                      2.655k ± 0%   2.646k ± 0%       ~ (p=0.145 n=6)
SerializeNative/STEFU/serialize-4                      884.5 ± 0%    884.0 ± 0%       ~ (p=0.545 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=0.924 n=6)
SerializeFromPdata/STEFU/serialize-4                   885.5 ± 0%    886.0 ± 0%       ~ (p=0.182 n=6)
DeserializeToPdata/STEF/deserialize-4                 756.2k ± 0%   756.2k ± 0%  -0.00% (p=0.015 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=0.848 n=6)
STEFDeserializeMultipart/astronomy-otelmetrics-4      2.295k ± 0%   2.294k ± 0%  -0.04% (p=0.013 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=0.011 n=6)
ReadSTEFZWriteSTEF-4                                  1.234k ± 0%   1.233k ± 0%  -0.08% (p=0.002 n=6)
geomean                                               6.361k        6.354k       -0.11%
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                    8.253m ±  6%
SerializeNative/STEFU/serialize-4                   35.09m ±  1%
DeserializeNative/STEF/deser-4                      2.407m ±  1%
DeserializeNative/STEFU/deser-4                     7.175m ±  1%
SerializeFromPdata/STEF/serialize-4                 132.7m ±  2%
SerializeFromPdata/STEFU/serialize-4                35.04m ±  2%
DeserializeToPdata/STEF/deserialize-4               46.27m ±  2%
DeserializeToPdata/STEFU/deserialize-4              62.72m ±  1%
STEFReaderRead-4                                    2.483m ±  1%
STEFSerializeMultipart/astronomy-otelmetrics-4       3.300 ± 23%
STEFDeserializeMultipart/astronomy-otelmetrics-4    78.45m ± 11%
ReadSTEF-4                                          2.451m ±  4%
ReadSTEFZ-4                                         3.137m ±  2%
ReadSTEFZWriteSTEF-4                                7.340m ±  1%
geomean                                             20.58m

                                                 │ bench-new.txt │
                                                 │   sec/point   │
SerializeNative/STEF/serialize-4                    123.5n ±  6%
SerializeNative/STEFU/serialize-4                   524.8n ±  1%
DeserializeNative/STEF/deser-4                      36.01n ±  1%
DeserializeNative/STEFU/deser-4                     107.3n ±  1%
SerializeFromPdata/STEF/serialize-4                 1.985µ ±  2%
SerializeFromPdata/STEFU/serialize-4                524.1n ±  2%
DeserializeToPdata/STEF/deserialize-4               692.1n ±  2%
DeserializeToPdata/STEFU/deserialize-4              938.2n ±  1%
STEFReaderRead-4                                    37.14n ±  1%
STEFSerializeMultipart/astronomy-otelmetrics-4      4.194µ ± 23%
STEFDeserializeMultipart/astronomy-otelmetrics-4    99.72n ± 11%
ReadSTEF-4                                          36.68n ±  4%
ReadSTEFZ-4                                         46.95n ±  2%
ReadSTEFZWriteSTEF-4                                109.8n ±  1%
geomean                                             216.5n

                                                 │ bench-new.txt │
                                                 │     B/op      │
SerializeNative/STEF/serialize-4                    3.339Mi ± 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                     2.646k ± 0%
SerializeNative/STEFU/serialize-4                     884.0 ± 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                                              6.354k

@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
Eliminate unnecessary nextChunk logic during reading
5e36e54 
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 03e2d9d to 5e36e54 Compare December 19, 2025 05:17
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