Re: depending on a customized library
>>>>> "Michael" == Michael K Edwards <m.k.edwards@gmail.com> writes:
Michael> On 5/18/05, Hubert Chan <hubert@uhoreg.ca> wrote:
>> The configure flags for compiling libgc are: --disable-threads
>> --disable-shared --enable-cplusplus (obviously with --disable-threads
>> toggled for the different tests). I'm also running on a
>> single-processor machine.
Michael> Not a hyperthreaded Xeon, for instance?
No, I'm running on a Pentium M.
Michael> Are you running a UP kernel so that (kernel-level) spinlocks
Michael> are no-ops?
I'm running on a kernel that has SMP support disabled. (The kernel
.config contains "# CONFIG_SMP is not set".) Kernel preemption is
turned on, though; I don't know if that makes a difference.
Michael> Note also that the libgc implementation of threading primitives
Michael> on Linux was historically tied pretty closely to linuxthreads,
Michael> and parsed "cpu" lines out of /proc/stat to find out whether to
Michael> use UP or SMP tunings. I haven't looked at the current code
Michael> yet, but you might want to make sure you are compiling
Michael> specifically for NPTL and do not have USE_SPIN_LOCK defined
Michael> (which forces the use of a libgc spinlock implementation that
Michael> loses on NPTL).
Well, I'm trying to compare the single-threaded libgc against the stock
libgc that is in Debian, so for my baseline, I'm not going to do
anything that Ryan doesn't do in his package (other than, of course,
static linking, to make the comparison fair).
--
Hubert Chan <hubert@uhoreg.ca> - http://www.uhoreg.ca/
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