Here is my case:
writeIndex function takes about 39% in pprof flame graph. I dive into it
and find out that we use POA consensus, therefore mining addresses have
a big bitmap.
```
func writeIndex(blocknum uint64, changes *historyv2.ChangeSet, bucket string, changeDb kv.RwTx) error {
buf := bytes.NewBuffer(nil)
for _, change := range changes.Changes {
k := dbutils.CompositeKeyWithoutIncarnation(change.Key)
index, err := bitmapdb.Get64(changeDb, bucket, k, math.MaxUint32, math.MaxUint32)
if err != nil {
return fmt.Errorf("find chunk failed: %w", err)
}
index.Add(blocknum)
if err = bitmapdb.WalkChunkWithKeys64(k, index, bitmapdb.ChunkLimit, func(chunkKey []byte, chunk *roaring64.Bitmap) error {
buf.Reset()
if _, err = chunk.WriteTo(buf); err != nil {
return err
}
return changeDb.Put(bucket, chunkKey, common.CopyBytes(buf.Bytes()))
}); err != nil {
return err
}
}
return nil
}
```
assume that a mining address has a big bitmap (Cardinality 400000), then
"writeIndex" will split it into 300 small bitmaps according to
”ChunkLimit“ and next time "writeIndex" will union all small bitmaps
into a big bitmap， then use binary search to split it into 300 small
bitmaps. over and over again.
I think blockNum > index.Maximum(), so that we only need get the last
one of 300 small bitmaps .
Co-authored-by: mengweifu <75886642@qq.com>
Bumps
[github.com/supranational/blst](https://github.com/supranational/blst)
from 0.3.10 to 0.3.11.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/supranational/blst/releases">github.com/supranational/blst's
releases</a>.</em></p>
<blockquote>
<h2>Release v0.3.11</h2>
<p>Essential changes:</p>
<ul>
<li>security bugfix in Go bindings</li>
<li>run-time switch in portable build</li>
<li>no-std support [exercised with limited stack size of 56K]</li>
<li>serde support</li>
<li>blst_miller_loop_n interface, with parallelized Rust and Go
counterparts</li>
<li>optional blst_fr_pentaroot subroutine</li>
<li>Emscripten bindings</li>
<li>hardened security on non-asm platforms</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="3dd0f804b1"><code>3dd0f80</code></a>
bindings/rust/Cargo.toml: bump the version number.</li>
<li><a
href="fb91221c91"><code>fb91221</code></a>
bindings/go/blst.go: fix logical error in SigValidate.</li>
<li><a
href="c6a3cc00ca"><code>c6a3cc0</code></a>
build.sh: don't pass -mno-avx unless actually required.</li>
<li><a
href="9fa8bcfb93"><code>9fa8bcf</code></a>
vect.h: tolerate compilation with -std=cNM flag.</li>
<li><a
href="5aa7ce1d6f"><code>5aa7ce1</code></a>
bindings/<swig-based>/*: minimize dynamic library symbol
pollution.</li>
<li><a
href="e1a44c97c0"><code>e1a44c9</code></a>
build.sh: drop --version-script linker argument.</li>
<li><a
href="492319a8c0"><code>492319a</code></a>
cpuid.c: adjust symbol visibility.</li>
<li><a
href="6dd7aa4ed9"><code>6dd7aa4</code></a>
Execute build/refresh.sh.</li>
<li><a
href="701e42a70b"><code>701e42a</code></a>
asm/ct_*: add missing .hidden directives.</li>
<li><a
href="dce883beb4"><code>dce883b</code></a>
Execute build/refresh.sh.</li>
<li>Additional commits viewable in <a
href="https://github.com/supranational/blst/compare/v0.3.10...v0.3.11">compare
view</a></li>
</ul>
</details>
<br />
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I'm not sure what caused this failure (for instance, CI for PR #7888 was
green), but currently we have the following test failure in `devel`:
```
--- FAIL: TestGnosisForkDigest (0.00s)
fork_test.go:79:
Error Trace: github.com/ledgerwatch/erigon/cl/fork/fork_test.go:79
Error: Not equal:
expected: [4]uint8{0x82, 0x4b, 0xe4, 0x31}
actual : [4]uint8{0x21, 0xa6, 0xf8, 0x36}
```
