From 89d2adadbdef4ce62338d55d56b58fa58055d495 Mon Sep 17 00:00:00 2001 From: Neil Alexander Date: Fri, 10 Jun 2022 10:58:04 +0100 Subject: [PATCH] Attempt to raise the file descriptor limit at startup (#2527) --- setup/base/sanity_unix.go | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-) diff --git a/setup/base/sanity_unix.go b/setup/base/sanity_unix.go index 0c1543e0b..c630d3f19 100644 --- a/setup/base/sanity_unix.go +++ b/setup/base/sanity_unix.go @@ -15,8 +15,21 @@ func platformSanityChecks() { // If we run out of file descriptors, we might run into problems accessing // PostgreSQL amongst other things. Complain at startup if we think the // number of file descriptors is too low. - var rLimit syscall.Rlimit - if err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, &rLimit); err == nil && rLimit.Cur < 65535 { + warn := func(rLimit *syscall.Rlimit) { logrus.Warnf("IMPORTANT: Process file descriptor limit is currently %d, it is recommended to raise the limit for Dendrite to at least 65535 to avoid issues", rLimit.Cur) } + var rLimit syscall.Rlimit + if err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, &rLimit); err == nil && rLimit.Cur < 65535 { + // The file descriptor count is too low. Let's try to raise it. + rLimit.Cur = 65535 + if err = syscall.Setrlimit(syscall.RLIMIT_NOFILE, &rLimit); err != nil { + // We failed to raise it, so log an error. + logrus.WithError(err).Warn("IMPORTANT: Failed to raise the file descriptor limit") + warn(&rLimit) + } else if err = syscall.Getrlimit(syscall.RLIMIT_NOFILE, &rLimit); err == nil && rLimit.Cur < 65535 { + // We think we successfully raised the limit, but a second call to + // get the limit told us that we didn't succeed. Log an error. + warn(&rLimit) + } + } }