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Commite35d396

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Fix pgbench performance issue induced by commitaf35fe5.
Commitaf35fe5 caused "pgbench -i" to emit a '\r' characterfor each data row loaded (when stderr is a terminal).That's effectively invisible on-screen, but it causes theconnected terminal program to consume a lot of cycles.It's even worse if you're connected over ssh, as the datathen has to pass through the ssh tunnel.Simplest fix is to move the added logic inside the if-teststhat check whether to print a progress line. We could doit another way that avoids duplicating these few lines,but on the whole this seems the most transparent way towrite it.Like the previous commit, back-patch to all supported versions.Reported-by: Andres Freund <andres@anarazel.de>Author: Tom Lane <tgl@sss.pgh.pa.us>Reviewed-by: Nathan Bossart <nathandbossart@gmail.com>Discussion:https://postgr.es/m/4k4drkh7bcmdezq6zbkhp25mnrzpswqi2o75d5uv2eeg3aq6q7@b7kqdmzzwzgbBackpatch-through: 13
1 parent480acbb commite35d396

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‎src/bin/pgbench/pgbench.c

Lines changed: 20 additions & 10 deletions
Original file line numberDiff line numberDiff line change
@@ -5010,6 +5010,16 @@ initPopulateTable(PGconn *con, const char *table, int64 base,
50105010
j,total,
50115011
(int) ((j*100) /total),
50125012
table,elapsed_sec,remaining_sec);
5013+
5014+
/*
5015+
* If the previous progress message is longer than the current
5016+
* one, add spaces to the current line to fully overwrite any
5017+
* remaining characters from the previous message.
5018+
*/
5019+
if (prev_chars>chars)
5020+
fprintf(stderr,"%*c",prev_chars-chars,' ');
5021+
fputc(eol,stderr);
5022+
prev_chars=chars;
50135023
}
50145024
/* let's not call the timing for each row, but only each 100 rows */
50155025
elseif (use_quiet&& (j %100==0))
@@ -5025,20 +5035,20 @@ initPopulateTable(PGconn *con, const char *table, int64 base,
50255035
(int) ((j*100) /total),
50265036
table,elapsed_sec,remaining_sec);
50275037

5038+
/*
5039+
* If the previous progress message is longer than the current
5040+
* one, add spaces to the current line to fully overwrite any
5041+
* remaining characters from the previous message.
5042+
*/
5043+
if (prev_chars>chars)
5044+
fprintf(stderr,"%*c",prev_chars-chars,' ');
5045+
fputc(eol,stderr);
5046+
prev_chars=chars;
5047+
50285048
/* skip to the next interval */
50295049
log_interval= (int)ceil(elapsed_sec /LOG_STEP_SECONDS);
50305050
}
50315051
}
5032-
5033-
/*
5034-
* If the previous progress message is longer than the current one,
5035-
* add spaces to the current line to fully overwrite any remaining
5036-
* characters from the previous message.
5037-
*/
5038-
if (prev_chars>chars)
5039-
fprintf(stderr,"%*c",prev_chars-chars,' ');
5040-
fputc(eol,stderr);
5041-
prev_chars=chars;
50425052
}
50435053

50445054
if (chars!=0&&eol!='\n')

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