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Tweak exit port statistics a bit.

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Introduce a threshold of 0.01% of bytes that must be read and written per
port in order to be included in the statistics. Otherwise we cannot include
these statistics in extra-info documents, because they are too big.

Change the labels "-written" and "-read" so that the meanings are as
intended.
This commit is contained in:
Karsten Loesing 2009-07-09 23:55:13 +02:00
parent 041a7b9896
commit 7fb206e554
1 changed files with 56 additions and 22 deletions
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46
src/or/rephist.c
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@ -1330,6 +1330,9 @@ rep_hist_note_bytes_read(size_t num_bytes, time_t when)
#define EXIT_STATS_ROUND_UP_STREAMS 4
/** Number of TCP ports */
#define EXIT_STATS_NUM_PORTS 65536
/** Reciprocal of threshold (= 0.01%) of total bytes that a port needs to
* see in order to be included in exit stats. */
#define EXIT_STATS_THRESHOLD 10000
/* The following data structures are arrays and no fancy smartlists or maps,
* so that all write operations can be done in constant time. This comes at
@ -1351,7 +1354,8 @@ write_exit_stats(time_t when)
{
char t[ISO_TIME_LEN+1];
int r, i, comma;
uint64_t *b;
uint64_t *b, total_bytes, other_bytes;
uint32_t other_streams;
char *filename = get_datadir_fname("exit-stats");
open_file_t *open_file = NULL;
@ -1376,17 +1380,30 @@ write_exit_stats(time_t when)
if (fprintf(out, "written %s (%d s)\n", t, EXIT_STATS_INTERVAL_SEC) < 0)
goto done;
/* Count the total number of bytes, so that we can attribute all
* observations below a threshold of 1 / EXIT_STATS_THRESHOLD of all
* bytes to a special port 'other'. */
total_bytes = 0;
for (i = 1; i < EXIT_STATS_NUM_PORTS; i++) {
total_bytes += exit_bytes_read[i];
total_bytes += exit_bytes_written[i];
}
/* kibibytes-(read|written) port=kibibytes,.. */
for (r = 0; r < 2; r++) {
b = r ? exit_bytes_read : exit_bytes_written;
tor_assert(b);
if (fprintf(out, "%s ",
r == 0 ? "kibibytes-read" : "kibibytes-written")<0)
r ? "kibibytes-read" : "kibibytes-written")<0)
goto done;
comma = 0;
other_bytes = 0;
for (i = 1; i < EXIT_STATS_NUM_PORTS; i++) {
if (b[i] > 0) {
if (exit_bytes_read[i] + exit_bytes_written[i] > 0 &&
(total_bytes / (exit_bytes_read[i] + exit_bytes_written[i])
< EXIT_STATS_THRESHOLD)) {
uint64_t num = b[i];
num += EXIT_STATS_ROUND_UP_BYTES - 1;
num /= EXIT_STATS_ROUND_UP_BYTES;
@ -1396,19 +1413,28 @@ write_exit_stats(time_t when)
comma++ ? "," : "", i,
U64_PRINTF_ARG(num)) < 0)
goto done;
} else
other_bytes += b[i];
}
}
if (fprintf(out, "\n")<0)
other_bytes += EXIT_STATS_ROUND_UP_BYTES - 1;
other_bytes /= EXIT_STATS_ROUND_UP_BYTES;
other_bytes *= EXIT_STATS_ROUND_UP_BYTES;
other_bytes /= 1024;
if (fprintf(out, "%sother="U64_FORMAT"\n",
comma ? "," : "", other_bytes)<0)
goto done;
/* Reset counters */
memset(b, 0, EXIT_STATS_NUM_PORTS*sizeof(uint64_t));
}
/* streams-opened port=num,.. */
if (fprintf(out, "streams-opened ")<0)
goto done;
comma = 0;
other_streams = 0;
for (i = 1; i < EXIT_STATS_NUM_PORTS; i++) {
if (exit_streams[i] > 0) {
if (exit_bytes_read[i] + exit_bytes_written[i] > 0 &&
(total_bytes / (exit_bytes_read[i] + exit_bytes_written[i])
< EXIT_STATS_THRESHOLD)) {
uint32_t num = exit_streams[i];
num += EXIT_STATS_ROUND_UP_STREAMS - 1;
num /= EXIT_STATS_ROUND_UP_STREAMS;
@ -1416,11 +1442,19 @@ write_exit_stats(time_t when)
if (fprintf(out, "%s%d=%d",
comma++ ? "," : "", i, num)<0)
goto done;
} else
other_streams += exit_streams[i];
}
}
if (fprintf(out, "\n")<0)
other_streams += EXIT_STATS_ROUND_UP_STREAMS - 1;
other_streams /= EXIT_STATS_ROUND_UP_STREAMS;
other_streams *= EXIT_STATS_ROUND_UP_STREAMS;
if (fprintf(out, "%sother=%d\n",
comma ? "," : "", other_streams)<0)
goto done;
/* Reset counters */
memset(exit_bytes_read, 0, sizeof(exit_bytes_read));
memset(exit_bytes_written, 0, sizeof(exit_bytes_written));
memset(exit_streams, 0, sizeof(exit_streams));
end_of_current_exit_stats_period += EXIT_STATS_INTERVAL_SEC;
}