Yeah i did something similar when purifying and quantifying on the
Solaris box - I thought >20% of total cpu for initialising 64 objects
was a bit much, I guess the timing/scheduling is different enough on
solaris to make the algorithm really not work well.
I wonder who this should go to ...
On Fri, 2002-04-19 at 10:13, Chris Toshok wrote:
> doh, fixed the return statement without a return value.
>
> Chris
>
> On Thu, 2002-04-18 at 18:37, Chris Toshok wrote:
> > So, when remotely displaying from my sparc to a machine on the same lan
> > it takes 48 seconds to bring up the first window. This change to
> > genrand.c (rolling orbit2's genuid_simple in, and using that when
> > buf_len is 8 or more) drops it down to 18 seconds.
> >
> > Displaying locally the time after the patch is 12 seconds from start to
> > first window, so there's probably still some room for improvement
> > elsewhere.
> >
> > Doesn't appear to noticeably change freebsd's startup time (it was ~4-5
> > seconds before and after the change).
>
> ----
>
> Index: genrand.c
> ===================================================================
> RCS file: /cvs/gnome/ORBit/src/orb/genrand.c,v
> retrieving revision 1.2.4.1
> diff -u -r1.2.4.1 genrand.c
> --- genrand.c 18 Jan 2001 20:16:44 -0000 1.2.4.1
> +++ genrand.c 19 Apr 2002 00:42:04 -0000
> @@ -29,6 +29,44 @@
> return TRUE;
> }
>
> +static void
> +orbit2_xor_buffer (guchar *buffer, int length)
> +{
> + static glong s = 0x6b842128;
> + glong i, t;
> + GTimeVal time;
> +
> + g_get_current_time (&time);
> +
> + t = time.tv_sec ^ time.tv_usec;
> +
> + for (i = 0; i < length; i++)
> + buffer [i] ^= (guchar) (s ^ (t << i));
> +
> + s ^= t;
> +}
> +
> +static gboolean
> +orbit2_genrand_simple(guchar *buffer, int buf_len)
> +{
> + static guint32 inc = 0;
> + pid_t pid = getpid();
> +
> + if (buf_len < 8)
> + return FALSE;
> +
> + memset (buffer, 0, buf_len);
> +
> + inc++;
> +
> + memcpy (buffer, &inc, 4);
> + memcpy (buffer + 4, &pid, 4);
> +
> + orbit2_xor_buffer (buffer, buf_len);
> +
> + return TRUE;
> +}
> +
> static volatile int received_alarm = 0;
>
> static void
> @@ -105,6 +143,8 @@
> g_return_if_fail(buf_len);
>
> if(genrand_dev(buffer, buf_len))
> + return;
> + else if(orbit2_genrand_simple(buffer, buf_len))
> return;
> else if(genrand_unix(buffer, buf_len))
> return;
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