On 11/10/2021 10:36 AM, Rebecca Cran wrote:
I just tried to run fio (from master) on my new M1 Max MacBook Pro
running macOS Monterey. "./fio examples/tiobench-example.fio" quit
with the error "failed to setup shm segment" but "ipcs" doesn't show
any entries, so it doesn't appear to be the typical problem of
left-over segments.
It turns out that there's just not enough shared memory available by
default (shmall is 1024). I installed the following SharedMemory.plist
file into /Library/LaunchDaemons after which it worked.
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN"
"http://www.apple.com/DTDs/PropertyList-1.0.dtd";>
<plist version="1.0">
<dict>
<key>Label</key>
<string>shmemsetup</string>
<key>UserName</key>
<string>root</string>
<key>GroupName</key>
<string>wheel</string>
<key>ProgramArguments</key>
<array>
<string>/usr/sbin/sysctl</string>
<string>-w</string>
<string>kern.sysv.shmmax=33554432</string>
<string>kern.sysv.shmmni=32</string>
<string>kern.sysv.shmseg=8</string>
<string>kern.sysv.shmall=8192</string>
<string>kern.sysv.shmmin=1</string>
</array>
<key>KeepAlive</key>
<false/>
<key>RunAtLoad</key>
<true/>
</dict>
</plist>
--
Rebecca Cran
