[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Gcl-devel] What do the times represent

From: Blake McBride
Subject: Re: [Gcl-devel] What do the times represent
Date: Tue, 28 Oct 2014 21:21:33 -0500

Perhaps you are right.  I thought "run-gbc" was time in GC.  In that case it would have been drastic.  The "gbc" time, while clearly not drastic, is significant.  Building GCL takes a bit of time.  Given how much memory machines have these days, bumping up the build-time memory footprint may be worth it.

Thanks for the response.


On Tue, Oct 28, 2014 at 7:27 PM, Camm Maguire <address@hidden> wrote:

Blake McBride <address@hidden> writes:

> When building GCL I get messages like this:
> real time       :     32.630 secs
> run-gbc time    :     26.180 secs
> child run time  :      2.259 secs
> gbc time        :      4.119 secs
> I know what "real time" is.  What do the other times represent?

child time -- time spent in forked children, mostly gcc.
gbc time -- garbage collection time
run-gbc time -- time spent in GCL proper outside of garbage collection.

> In particular, I am wondering about "run-gbc time" and "gbc time".  If "gbc" is garbage collection, I am wondering if there is some parameter that
> can be set for building the system using a larger heap so that their are fewer - or no - garbage collections.  If my interpretations are correct,
> this could drastically speed system build time.

What the figures above show is that one might save ~12% if gc could be
eliminated entirely.  Indeed, there are many settings which affect this
proportion, including the pre-allocation of various memory types.  One
might have a large image for system building, and a minimal final image
for final use, as it is generally desirable to minimize the disk image
and not guess what the user's memory demands are likely to be.  I'm
skeptical that 'drastic' savings are possible.

Take care,

> Blake McBride
> _______________________________________________
> Gcl-devel mailing list
> address@hidden
> https://lists.gnu.org/mailman/listinfo/gcl-devel

Camm Maguire                                        address@hidden
"The earth is but one country, and mankind its citizens."  --  Baha'u'llah

reply via email to

[Prev in Thread] Current Thread [Next in Thread]