Compiling subversion for performance on Solaris

  --with-devrandom=/dev/urandom  Use non-blocking pseudo-random number device

  --enable-nonportable-atomics  Use optimized atomic code which may produce nonportable binaries

The nonportable-atomics option uses an atomic UltraSparc microcode instruction to replace an entire mutex algorithm (the same option works on modern Intel processors also).

Update: Although, according to the APR-0.9 change notes the solaris specific atomic code was removed due to licensing concerns... Might try to track that down and reapply locally (it said it was licenced MPL 1.0 so no problem using it locally AFAICT).

So here it is in the 0.9.3 tag: http://svn.apache.org/viewvc/apr/apr/tags/0.9.3/atomic/solaris_sparc/ but the build process has radically changed since then so I'll need to figure out how to port the assembler source into inline gcc asm for the unified unix/apr_atomic.c in current versions.

I'll post when/if I get success!

Update 2: Here's a patch for ISA independant Solaris 10 atomics, but that doesn't help me since I'm on Solaris 8.

And here's another patch, this time for the x86 specific atomics for Solaris x86, which also doesn't help me since I'm on UltraSparc :(