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SyslogTarget - Reduce allocations for writing Octet header#5784

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snakefoot merged 1 commit intoNLog:devfrom
snakefoot:SysLogOctetHeader
Apr 24, 2025
Merged

SyslogTarget - Reduce allocations for writing Octet header#5784
snakefoot merged 1 commit intoNLog:devfrom
snakefoot:SysLogOctetHeader

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@snakefoot snakefoot commented Apr 24, 2025

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@snakefoot snakefoot added this to the 6.0 milestone Apr 24, 2025
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coderabbitai bot commented Apr 24, 2025 •
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Walkthrough

The changes introduce a debug log statement in the network sender creation process and implement a caching mechanism for octet header byte arrays in the syslog target. The debug log provides visibility when a new network sender is instantiated. The syslog target now uses a private helper method to cache and reuse ASCII-encoded octet headers for counts below a certain threshold, potentially reducing memory allocations. No public APIs or exported entity signatures were altered; all new fields and methods remain private.

Changes

File(s) Change Summary
src/NLog.Targets.Network/Targets/NetworkTarget.cs Added a debug log statement in GetCachedNetworkSender before creating a new NetworkSender.
src/NLog.Targets.Network/Targets/SyslogTarget.cs Refactored octet header generation to use a private cached byte array via GenerateOctetHeader.

Poem

In the warren of code, a debug log appears,
Tracking new senders as the network clears.
Octet headers now cached, swift as a hare,
Saving some bytes, with efficiency to spare.
With every small tweak, our logs hop ahead—
A rabbit’s delight in the changes we’ve bred!
🐇✨

📜 Recent review details

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Review profile: CHILL
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📥 Commits

Reviewing files that changed from the base of the PR and between be1ef34 and 6a404ed.

📒 Files selected for processing (2)
  • src/NLog.Targets.Network/Targets/NetworkTarget.cs (1 hunks)
  • src/NLog.Targets.Network/Targets/SyslogTarget.cs (1 hunks)
🔇 Additional comments (3)
src/NLog.Targets.Network/Targets/NetworkTarget.cs (1)

635-635: LGTM - Added debug logging for network server creation.

This logging statement will help with debugging by providing visibility when new network servers are created. Good addition for troubleshooting connection issues.

src/NLog.Targets.Network/Targets/SyslogTarget.cs (2)

114-114: LGTM - Good refactoring to use the new caching method.

The change replaces direct byte array creation with a call to the new caching method, which should help reduce allocations.

121-134: Good optimization to cache octet headers.

This implementation caches ASCII-encoded octet headers for counts below 4046, which will reduce memory allocations for frequently used header sizes. The cache is lazily initialized which is memory efficient.

A few observations:

  1. Thread safety is maintained through idempotent operations
  2. The cache size (4046) seems appropriate for typical syslog messages
  3. For larger octet counts, it falls back to on-demand generation

This is a nice performance optimization that should reduce GC pressure, especially in high-throughput scenarios.

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sonarqubecloud bot commented Apr 24, 2025

Quality Gate Passed Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
11.1% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

@snakefoot snakefoot merged commit ed8329a into NLog:dev Apr 24, 2025
6 checks passed
ana1250 pushed a commit to ana1250/NLog that referenced this pull request Apr 24, 2025
@snakefoot @ana1250
SyslogTarget - Reduce allocations for writing Octet header (NLog#5784)
6b4a5bd
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