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Hacker NewsLinux CLI tool to provide mutex locks for long running bash ops<a href="https://github.com/bigattichouse/waitlock" rel="nofollow noopener" translate="no" target="_blank">https://github.com/bigattichouse/waitlock</a><a href="https://mastodon.social/tags/HackerNews" class="mention hashtag" rel="nofollow noopener" target="_blank">#HackerNews</a> <a href="https://mastodon.social/tags/Linux" class="mention hashtag" rel="nofollow noopener" target="_blank">#Linux</a> <a href="https://mastodon.social/tags/CLI" class="mention hashtag" rel="nofollow noopener" target="_blank">#CLI</a> <a href="https://mastodon.social/tags/mutex" class="mention hashtag" rel="nofollow noopener" target="_blank">#mutex</a> <a href="https://mastodon.social/tags/locks" class="mention hashtag" rel="nofollow noopener" target="_blank">#locks</a> <a href="https://mastodon.social/tags/bash" class="mention hashtag" rel="nofollow noopener" target="_blank">#bash</a> <a href="https://mastodon.social/tags/scripting" class="mention hashtag" rel="nofollow noopener" target="_blank">#scripting</a> <a href="https://mastodon.social/tags/open" class="mention hashtag" rel="nofollow noopener" target="_blank">#open</a> <a href="https://mastodon.social/tags/source" class="mention hashtag" rel="nofollow noopener" target="_blank">#source</a> <a href="https://mastodon.social/tags/tools" class="mention hashtag" rel="nofollow noopener" target="_blank">#tools</a> <a href="https://mastodon.social/tags/GitHub" class="mention hashtag" rel="nofollow noopener" target="_blank">#GitHub</a>

Felix Palmen :freebsd: :c64:More interesting progress trying to make <a href="https://mastodon.bsd.cafe/tags/swad" class="mention hashtag" rel="nofollow noopener" target="_blank">#swad</a> suitable for very busy sites!I realized that <a href="https://mastodon.bsd.cafe/tags/TLS" class="mention hashtag" rel="nofollow noopener" target="_blank">#TLS</a> (both with <a href="https://mastodon.bsd.cafe/tags/OpenSSL" class="mention hashtag" rel="nofollow noopener" target="_blank">#OpenSSL</a> and <a href="https://mastodon.bsd.cafe/tags/LibreSSL" class="mention hashtag" rel="nofollow noopener" target="_blank">#LibreSSL</a>) is a *major* bottleneck. With TLS enabled, I couldn't cross 3000 requests per second, with somewhat acceptable response times (most below 500ms). Disabling TLS, I could really see the impact of a <a href="https://mastodon.bsd.cafe/tags/lockfree" class="mention hashtag" rel="nofollow noopener" target="_blank">#lockfree</a> queue as opposed to one protected by a <a href="https://mastodon.bsd.cafe/tags/mutex" class="mention hashtag" rel="nofollow noopener" target="_blank">#mutex</a>. With the mutex, up to around 8000 req/s could be reached on the same hardware. And with a lockfree design, that quickly went beyond 10k req/s, but crashed. 😆So I read some scientific papers 🙈 ... and redesigned a lot (*). And now it finally seems to work. My latest test reached a throughput of almost 25k req/s, with response times below 10ms for most requests! I really didn't expect to see *this* happen. 🤩 Maybe it could do even more, didn't try yet.Open issue: Can I do something about TLS? There *must* be some way to make it perform at least a *bit* better...(*) edit: Here's the design I finally used, with a much simplified "dequeue" because the queues in question are guaranteed to have only a single consumer: <a href="https://dl.acm.org/doi/10.1145/248052.248106" rel="nofollow noopener" translate="no" target="_blank">https://dl.acm.org/doi/10.1145/248052.248106</a>

IT NewsMake Your Code Slower With Multithreading - With the performance of modern CPU cores plateauing recently, the main performance... - <a href="https://hackaday.com/2024/06/07/make-your-code-slower-with-multithreading/" rel="nofollow noopener" translate="no" target="_blank">https://hackaday.com/2024/06/07/make-your-code-slower-with-multithreading/</a> <a href="https://schleuss.online/tags/multithreading" class="mention hashtag" rel="nofollow noopener" target="_blank">#multithreading</a> <a href="https://schleuss.online/tags/softwarehacks" class="mention hashtag" rel="nofollow noopener" target="_blank">#softwarehacks</a> <a href="https://schleuss.online/tags/performance" class="mention hashtag" rel="nofollow noopener" target="_blank">#performance</a> <a href="https://schleuss.online/tags/profiling" class="mention hashtag" rel="nofollow noopener" target="_blank">#profiling</a> <a href="https://schleuss.online/tags/spinlocks" class="mention hashtag" rel="nofollow noopener" target="_blank">#spinlocks</a> <a href="https://schleuss.online/tags/syscall" class="mention hashtag" rel="nofollow noopener" target="_blank">#syscall</a> <a href="https://schleuss.online/tags/futex" class="mention hashtag" rel="nofollow noopener" target="_blank">#futex</a> <a href="https://schleuss.online/tags/mutex" class="mention hashtag" rel="nofollow noopener" target="_blank">#mutex</a> <a href="https://schleuss.online/tags/perf" class="mention hashtag" rel="nofollow noopener" target="_blank">#perf</a>

Ramesh #NotGoingBack⬆️ <a href="https://mastodon.online/@vidyarthi" class="u-url mention" rel="nofollow noopener" target="_blank">@vidyarthi</a> >> Shoe <a href="https://mastodon.social/tags/Semaphore" class="mention hashtag" rel="nofollow noopener" target="_blank">#Semaphore</a> > Any source?Are you contesting this to claim there was NO protection between the 5 <a href="https://mastodon.social/tags/Brothers" class="mention hashtag" rel="nofollow noopener" target="_blank">#Brothers</a> simultaneously entering a <a href="https://mastodon.social/tags/criticalSection" class="mention hashtag" rel="nofollow noopener" target="_blank">#criticalSection</a>, or are you claiming the <a href="https://mastodon.social/tags/mutex" class="mention hashtag" rel="nofollow noopener" target="_blank">#mutex</a> was of a DIFFERENT form?

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