Re: optimization level

On 1/1/17, Ian Silvester <[email protected]> wrote:
> A fair question, and the only answer I have is that that was the level
> suggested by Tobias Netzel when he compiled the PPC OS X binary :o)

I'm wondering if it's one of those "personal preference" things.  I'll
trade off a larger executable for a faster program - eg. adding a
TCP_BUFFER_SIZE define in project.h:
#define BUFFER_SIZE 5000
#define TCP_BUFFER_SIZE 46720    /* LR */
/* -LR- pick a buffer size that's a multiple of 1460
 * -LR- see http://sourceforge.net/mailarchive/message.php?msg_id=23602205
 * -LR- One can slightly speed-up Privoxy in some situations by
increasing the buffer "buf"
 * -LR- in jcc.c's chat(), trading off higher memory use for reduced
context switching:
 * -LR-   static void chat(struct client_state *csp)
 * -LR-   {
 * -LR-      char buf[TCP_BUFFER_SIZE];  -LR  was: char buf[BUFFER_SIZE]
 */

I changed configure.in to
            if test "X$CFLAGS" = "X "; then # if CFLAGS were unset (see above)
              if test "$GCC" = yes; then
                CFLAGS="-O3"
              fi
            fi
a while back & privoxy.exe is ~ 30KB larger using -O3 than it is using
-O2.  I haven't noticed any difference, but I haven't been looking
either..  I was mainly concerned that privoxy didn't blow up.

Lee


>
> My PGP public
> key[http://diem.serveftp.net:8080/IanSilvesterPGPPublicKey.asc]
>
> On Sun, 1 Jan 2017, at 15:28, Lee wrote:
>> Just out of curiosity .. why not
>> CFLAGS="-O3 ...
>>
>> -O3 makes a larger, but [hopefully? really?] faster, object file.
>>
>> Lee
>>
>> On 12/31/16, Ian Silvester <[email protected]> wrote:
>> > Update of /cvsroot/ijbswa/OSXPackageBuilder
>> > In directory sfp-cvs-1.v30.ch3.sourceforge.com:/tmp/cvs-serv10842
>> >
>> > Modified Files:
>> > 	build.sh
>> > Log Message:
>> > Added compilation optimisation flags to improve performance at the cost
>> > of
>> > increased binary size
>> >
>> >
>> > Index: build.sh
>> > ===================================================================
>> > RCS file: /cvsroot/ijbswa/OSXPackageBuilder/build.sh,v
>> > retrieving revision 1.9
>> > retrieving revision 1.10
>> > diff -C2 -d -r1.9 -r1.10
>> > *** build.sh	19 Jan 2016 02:54:43 -0000	1.9
>> > --- build.sh	31 Dec 2016 17:24:03 -0000	1.10
>> > ***************
>> > *** 88,92 ****
>> >   autoconf
>> >
>> > ! /usr/bin/env CFLAGS="${CFLAGS} ${SYSROOT} ${ARCH} ${MACOSX_VERSION}"
>> > LDFLAGS="${LDFLAGS} ${SYSROOT} ${ARCH} ${MACOSX_VERSION}" ./configure
>> > ${OPTS}
>> >
>> >   #
>> > --- 88,92 ----
>> >   autoconf
>> >
>> > ! /usr/bin/env CFLAGS="-O2 -mdynamic-no-pic ${CFLAGS} ${SYSROOT}
>> > ${ARCH}
>> > ${MACOSX_VERSION}" LDFLAGS="${LDFLAGS} ${SYSROOT} ${ARCH}
>> > ${MACOSX_VERSION}"
>> > ./configure ${OPTS}
>> >
>> >   #
>> >
>> >
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