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Top Forums Shell Programming and Scripting BASH Execution Delay / Speedup Post 302932983 by gmark99 on Monday 26th of January 2015 07:52:47 PM
Old 01-26-2015
BASH Execution Delay / Speedup

What the job does is take that line of the file that it's given as an argument and uses that to make seven or eight data accesses. Right now they're stubs, but in the future, they'll be accessing some hardware that may take awhile. Hence, spawning the job to run in background.

At first, I thought that running over 200 of these jobs as bogging down the machine. So I reduced the number, and reduced and reduced until I had a single job that made some accesses and exited. Still a huge delay at the end of the loop. But there's no testing there -- it's just supposed to return and run the loop again. The test for the line number in the file is in the inner loop. The outer loop continues reading a new copy of the external file *inside* the loop, not where the slowdown is occurring. Not knowing exactly what BASH is doing internally, I don't know what's going on at the head and footer of the loop. But it occasionally slows down a LOT.
 

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INGRES_NUM_ROWS(3)							 1							INGRES_NUM_ROWS(3)

ingres_num_rows - Get the number of rows affected or returned by a query

SYNOPSIS
int ingres_num_rows (resource $result) DESCRIPTION
This function primarily is meant to get the number of rows modified in the database. However, it can be used to retrieve the number of rows to fetch for a SELECT statement. Note If scrollable cursors are disabled and this function is called before using ingres_fetch_array(3), ingres_fetch_object(3), or ingres_fetch_row(3), the server will delete the result's data and the script will be unable to get them. Instead, you should retrieve the result's data using one of these fetch functions in a loop until it returns FALSE, indicating that no more results are available. PARAMETERS
o $result - The result identifier for a query RETURN VALUES
For delete, insert, or update queries, ingres_num_rows(3) returns the number of rows affected by the query. For other queries, ingres_num_rows(3) returns the number of rows in the query's result. SEE ALSO
ingres_query(3), ingres_fetch_array(3), ingres_fetch_assoc(3), ingres_fetch_object(3), ingres_fetch_row(3). PHP Documentation Group INGRES_NUM_ROWS(3)
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