https://luth.io/tags/tcp/ Recent content in Tcp on Luther Monson Hugo en Fri, 18 Sep 2026 20:05:00 -0700 https://luth.io/blog/2026/09/ephpm-smaller-angles/ Fri, 18 Sep 2026 20:05:00 -0700 https://luth.io/blog/2026/09/ephpm-smaller-angles/ <p>Not every fix in <a href="https://github.com/ephpm/ephpm">ePHPm</a> earns a full write-up. A few of the smaller ones have stuck with me because the lesson in each was bigger than the diff. Here are four from this summer.</p> <h3 id="a-release-build-the-oom-killer-kept-eating">A release build the OOM killer kept eating</h3> <p>ePHPm statically links libphp, ICU and a pile of other C libraries into one Rust binary. It ships for four targets. For the v0.4.2 performance release I set the release profile to <code>lto = &quot;fat&quot;</code> with <code>codegen-units = 1</code> (<a href="https://github.com/ephpm/ephpm/pull/171">#171</a>). Fat LTO pulls every crate&rsquo;s LLVM IR into one module in one process and optimizes it as a unit. One codegen unit removes the parallelism that would otherwise spread that memory out. That&rsquo;s one very large process at the final link.</p>