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Commit21b815f

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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 parentbbf1ef7 commit21b815f

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‎src/bin/pgbench/pgbench.c

Lines changed: 20 additions & 10 deletions
Original file line numberDiff line numberDiff line change
@@ -4983,6 +4983,16 @@ initGenerateDataClientSide(PGconn *con)
49834983
j, (int64)naccounts*scale,
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(int) (((int64)j*100) / (naccounts* (int64)scale)),
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elapsed_sec,remaining_sec);
4986+
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/*
4988+
* If the previous progress message is longer than the current
4989+
* one, add spaces to the current line to fully overwrite any
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* remaining characters from the previous message.
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*/
4992+
if (prev_chars>chars)
4993+
fprintf(stderr,"%*c",prev_chars-chars,' ');
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fputc(eol,stderr);
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prev_chars=chars;
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}
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/* let's not call the timing for each row, but only each 100 rows */
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elseif (use_quiet&& (j %100==0))
@@ -4997,20 +5007,20 @@ initGenerateDataClientSide(PGconn *con)
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j, (int64)naccounts*scale,
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(int) (((int64)j*100) / (naccounts* (int64)scale)),elapsed_sec,remaining_sec);
49995009

5010+
/*
5011+
* If the previous progress message is longer than the current
5012+
* one, add spaces to the current line to fully overwrite any
5013+
* remaining characters from the previous message.
5014+
*/
5015+
if (prev_chars>chars)
5016+
fprintf(stderr,"%*c",prev_chars-chars,' ');
5017+
fputc(eol,stderr);
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prev_chars=chars;
5019+
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/* skip to the next interval */
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log_interval= (int)ceil(elapsed_sec /LOG_STEP_SECONDS);
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}
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}
5004-
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/*
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* If the previous progress message is longer than the current one,
5007-
* add spaces to the current line to fully overwrite any remaining
5008-
* characters from the previous message.
5009-
*/
5010-
if (prev_chars>chars)
5011-
fprintf(stderr,"%*c",prev_chars-chars,' ');
5012-
fputc(eol,stderr);
5013-
prev_chars=chars;
50145024
}
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if (eol!='\n')

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