Caché Monitoring Guide - InterSystems Documentation

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Monitoring Performance Using ^mgstat Alternatively, running ^mgstat interactively to specify the same samplings, and to redisplay the headings after each 10 rows of data, enter the following: %SYS> DO ^mgstat(5,17280,,10) By default ^mgstat generates a filename based on the server name, configuration name, and date and time, with the “mgst” extension, which is recognized by an analyzer tool written in Microsoft Excel that aids graphing of the data. By default, the file is located in the manager's directory of the Caché instance (install-dir\mgr); if, however, the output directory has been changed through the ^pButtons utility (see Change Output Directory in the “Monitoring Performance Using ^pButtons” chapter in this guide), ^mgstat uses that output directory. Note: The mgst file is also generated when you run the ^pButtons utility (see the “Monitoring Performance Using ^pButtons” chapter in this guide. For VMS systems, where filenames are restricted to a limited length, the filename may be truncated, but the date and time stamp are always present. To ensure minimal impact on system performance, the ^mgstat utility extracts various counter information from shared memory. If the utility is running and an apparent performance issue occurs, data is available to help you investigate the problem; for assistance with your analysis, contact the InterSystems Worldwide Response Center (WRC), which can provide tasks that automate both the running of ^mgstat and the purging of files. Most of the reported data is averaged in per-second values, except as noted in the table below. The generated output file is in a readable, comma-separated value (CSV) format, which is more easily interpreted with a spreadsheet tool such as Microsoft Excel. The first line of the file is a header line which includes the filename and the utility version. as well information about buffer allocation and the version of the product being monitored. The number of columns of data depends on the version of the product: the first two columns are the date and time; the remaining columns are: Column Glorefs RemGrefs * GRratio PhyRds Rdratio Gloupds RemGupds * Rourefs Description Global references (database accesses). Indicates the amount of work that is occurring on behalf of the current workload; although global references consume CPU time, they do not always require physical reads because of the buffer pool. Remote global references (database accesses). Indicates the number of global references that are generated on behalf of ECP application servers. Ratio of global references to remote global references. Physical reads from disk. A high number of physical reads is high may indicate a performance problem; you can improve the performance by increasing the number of database (global) buffers. Ratio of physical block reads to logical block reads. Global updates (sets or kills). Remote global updates. Routine references (includes tag^routine). Notes 88 Caché Monitoring Guide
Column RemRrefs * RouLaS RemRLaS * PhyWrs WDQsz WDtmpq WDphase Description Remote routine references. Routine loads and saves (fetch from or save to disk). A high number of routine loads/saves may indicate a performance problem; you can improve the performance by increasing the number of routine buffers. Remote routine loads and saves. Physical writes to disk. Write Daemon Queue size (in blocks). Updated blocks in CACHETEMP. Phase of the Write Daemon. The most common phases are: • 0: Idle (WD is not running) • 5: WD is updating the Write Image Journal (WIJ) file. • 7: WD is committing WIJ and Journal. • 8: Databases are being updated. Notes Not per second. Not per second. Not available in Caché 5.0.x. Not per second. Wijwri RouCMs Jrnwrts GblSz pGblNsz pGblAsz RouSz pRouAsz Number of 256-KB blocks written to the WIJ. This is non-zero when the WD is writing data to the WIJ. Number of Routine Cache Misses. Number of blocks written to journals. Number of seizes on the global resource; see “Considering Seizes, ASeizes, and NSeizes” in this chapter. Percentage of NSeizes on the global resource; see “Considering Seizes, ASeizes, and NSeizes” in this chapter. Percentage of ASeizes on the global resource; see “Considering Seizes, ASeizes, and NSeizes” in this chapter. Number of seizes on the routine resource; see “Considering Seizes, ASeizes, and NSeizes” in this chapter. Percentage of ASeizes on the routine resource; see “Considering Seizes, ASeizes, and NSeizes” in this chapter. Not available in Caché 5.0.x. Caché 2007.1 and higher. Caché Monitoring Guide 89
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Caché Monitoring Guide Version 201
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Table of Contents About This Book .
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B.4 Caché MIB Structure ..........
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About This Book This book describes
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Monitoring Caché Using the Managem
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Using the Caché Diagnostic Report
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Using the Caché Monitor The option
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Using the Caché Monitor Option 4)
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Using the Caché Monitor 3.2 Caché
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Using the Caché Monitor Option 3)
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Using the Caché Monitor Option 4 1
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Using the Caché Monitor Input Fiel
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Using the Caché Monitor 3.2.2.1 Ge
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Using the Caché Monitor { // Get f
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4 Gathering Global Activity Statist
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