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Make "git clone" pack-fetching download statistics better 

Average it out over a few events to make the numbers stable, and fix the
silly usec->binary-ms conversion.

Yeah, yeah, it's arguably eye-candy to keep the user calm, but let's do
that right.

Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
This commit is contained in:
Linus Torvalds 2006-02-11 10:43:56 -08:00 committed by Junio C Hamano
parent 5ee2ad654b
commit c548cf4ee0
1 changed files with 41 additions and 3 deletions
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44
fetch-clone.c
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@ -130,12 +130,35 @@ int receive_unpack_pack(int fd[2], const char *me, int quiet)
die("git-unpack-objects died of unnatural causes %d", status);
}
/*
* We average out the download speed over this many "events", where
* an event is a minimum of about half a second. That way, we get
* a reasonably stable number.
*/
#define NR_AVERAGE (4)
/*
* A "binary msec" is a power-of-two-msec, aka 1/1024th of a second.
* Keeing the time in that format means that "bytes / msecs" means
* is the same as kB/s (modulo rounding).
*
* 1000512 is a magic number (usecs in a second, rounded up by half
* of 1024, to make "rounding" come out right ;)
*/
#define usec_to_binarymsec(x) ((int)(x) / (1000512 >> 10))
int receive_keep_pack(int fd[2], const char *me, int quiet)
{
char tmpfile[PATH_MAX];
int ofd, ifd;
unsigned long total;
static struct timeval prev_tv;
struct average {
unsigned long bytes;
unsigned long time;
} download[NR_AVERAGE] = { {0, 0}, };
unsigned long avg_bytes, avg_time;
int idx = 0;
ifd = fd[0];
snprintf(tmpfile, sizeof(tmpfile),
@ -146,6 +169,8 @@ int receive_keep_pack(int fd[2], const char *me, int quiet)
gettimeofday(&prev_tv, NULL);
total = 0;
avg_bytes = 0;
avg_time = 0;
while (1) {
char buf[8192];
ssize_t sz, wsz, pos;
@ -181,14 +206,27 @@ int receive_keep_pack(int fd[2], const char *me, int quiet)
gettimeofday(&tv, NULL);
msecs = tv.tv_sec - prev_tv.tv_sec;
msecs <<= 10;
msecs += (int)(tv.tv_usec - prev_tv.tv_usec) >> 10;
msecs += usec_to_binarymsec(tv.tv_usec - prev_tv.tv_usec);
if (msecs > 500) {
prev_tv = tv;
last = total;
fprintf(stderr, "%4lu.%03luMB (%lu kB/s) \r",
/* Update averages ..*/
avg_bytes += diff;
avg_time += msecs;
avg_bytes -= download[idx].bytes;
avg_time -= download[idx].time;
download[idx].bytes = diff;
download[idx].time = msecs;
idx++;
if (idx >= NR_AVERAGE)
idx = 0;
fprintf(stderr, "%4lu.%03luMB (%lu kB/s) \r",
total >> 20,
1000*((total >> 10) & 1023)>>10,
diff / msecs );
avg_bytes / avg_time );
}
}
}