Appendix PERFORMANCE COUNTERS SYS-ED/ COMPUTER EDUCATION TECHNIQUES, INC.

Size: px

Start display at page:

Download "Appendix PERFORMANCE COUNTERS SYS-ED/ COMPUTER EDUCATION TECHNIQUES, INC."

Eustace Davis
5 years ago
Views:

1 Appendix E PERFORMANCE COUNTERS SYS-ED/ COMPUTER EDUCATION TECHNIQUES, INC

2 1 Default s for Commonly Used Objects Object Default Cache Data Map Hits % How often requested data is found in the cache This is an indicator of application I/O A poor cache hit rate may indicate a memory shortage Logical Disk Average Disk Queue Length Measure of the activity of each logical partition of the disk An Average Disk Queue Length of 10 indicates that the logical disk was busy for the entire sample time Busy time includes all processing time for a disk I/O request, including driver time and time in the queue, so values for a single logical disk may exceed 10 Sustained high values over time indicated a possible disk bottleneck Memory Pages Number of pages between main memory and the disk drives in each second If this counter is consistently high, memory is in short supply Sustained paging degrades performance Objects Processes Instantaneous count of the number of processes running When charted with Processor: % Processor Time, it shows the effect on the processor of adding and removing processes Physical Disk Average Disk Queue Length Measure of the activity of the disk subsystem It is the sum of Average Disk Queue Length for all logical partitions of the disk This is a good measure of disk activity when measuring multiple physical disks in a disk set Process % Processor Time Measure of each process s use of the processor Processor % Processor Time Indicator of the demand for and efficiency of a processor System % Total Processor Time Monitors multiprocessor systems It combines the average processor usage of all processors into a single counter Thread % Processor Time Threads are the components of a process that execute its code on the processor This counter indicates which threads are getting processor time SYS-ED \COMPUTER EDUCATION TECHNIQUES, INC (W2000 Server - 36) APP E: Page i

3 2 s 21 Browser Object: s Announcements Domain Announcements Server Announcements Total Duplicate Master Announcement Election Packets Enumerations Domain Enumerations Others / second Enumerations Server / second Enumerations Total / second Illegal Datagrams / second Mailslot Allocations Failed Mailslot Opens Failed / second Mailslot Receives Failed Mailslot Writes Failed Mailslot Writes Missed Mailslot Datagrams Rate that a Domain has announced itself to the network Rate that the servers in this domain have announced themselves to this server Sum of Announcements Server and Announcements Domain Indicates the number of times that the master browser has detected another master browser on the same domain Rate of browser election packets that have been received by this workstation Rate of Domain browse requests that have been processed by this workstation Rate of browse requests processed by this workstation that were not domain or server browse requests Rate of Server browse requests that have been processed by this workstation Rate of browse requests that have been processed by this workstation This is the sum of Enumerations Server, Enumerations Domain, and Enumerations Other Rate of incorrectly formatted datagrams that have been received by the workstation Number of times the datagram receiver has failed to allocate a buffer to hold a user mailslot write Rate of mailslot messages received by this workstation that were to be delivered to mailslots that are not present on this workstation Number of mailslot messages that couldn't be received due to transport failures Total number of mailslot messages that have been successfully received, but that were unable to be written to the mailslot Rate of mailslot messages that have been successfully received Number of Mailslot Datagrams that have been discarded due to configuration or allocation limits SYS-ED \COMPUTER EDUCATION TECHNIQUES, INC (W2000 Server - 36) APP E: Page ii

4 Missed Server Announcements Missed Server List Requests Server Announcement Allocations Failed Server List Requests Number of server announcements that have been missed due to configuration or allocation limits Number of requests to retrieve a list of browser servers that were received by this workstation, but could not be processed Rate of server (or domain) announcements that have failed due to lack of memory Rate of requests to retrieve a list of browser servers that have been processed by this workstation SYS-ED \COMPUTER EDUCATION TECHNIQUES, INC (W2000 Server - 36) APP E: Page iii

5 22 Cache Object: s Cache Async Pin Reads Copy Read Hits Copy Reads Data Flush Pages Data Flushes Data Map Hits Data Map Pins Data Maps Fast Read Not Possibles Fast Read Resource Misses Fast Reads Lazy Write Flushes Lazy Write Pages MDL Read Hits MDL Reads Frequency of reading data into the Cache preparatory to writing the data back to disk Pages read in this fashion are pinned in memory at the completion of the read The file system will regain control immediately even if the disk must be accessed to retrieve the page While pinned, a page's physical address will not be altered Percentage of Cache Copy Read requests that hit the Cache, ie, did not require a disk read in order to provide access to the page in the Cache A Copy Read is a file read operation that is satisfied by a memory copy from a Cache page to the application's buffer The LAN Redirector uses this method for retrieving Cache information, as does the LAN Server for small transfers This is a method used by the disk file systems as well Frequency of reads from Cache pages that involve a memory copy of the data from the Cache to the application's buffer The LAN Redirector uses this method for retrieving Cache information, as does the LAN Server for small transfers This is a method used by the disk file systems as well Number of pages the Cache has flushed to disk as a result of a request to flush or to satisfy a write-through file write request More than one page can be transferred on each flush operation Frequency the Cache has flushed its contents to disk as the result of a request to flush or to satisfy a write-through file write request More than one page can be transferred on each flush operation Percentage of Data Maps in the Cache that could be resolved without having to retrieve a page from the disk, ie the page was already in physical memory Frequency of Data Maps in the Cache that resulted in pinning a page in main memory, an action usually preparatory to writing to the file on disk While pinned, a page's physical address in main memory and virtual address in the Cache will not be altered Frequency that a file system such as NTFS or HPFS maps a page of a file into the Cache to read the page Frequency of attempts by an Application Program Interface (API) function call to bypass the file system to get at Cache data, that could not be honored without invoking the file system after all Frequency of Cache misses necessitated by the lack of available resources to satisfy the request Frequency of reads from Cache pages that bypass the installed file system and retrieve the data directly from the Cache Normally, file I/O requests invoke the appropriate file system to retrieve data from a file, but this path permits direct retrieval of Cache data without file system involvement if the data is in the Cache Even if the data is not in the Cache, one invocation of the file system is avoided Frequency the Cache's Lazy Write thread has written to disk Lazy Writing is the process of updating the disk after the page has been changed in memory, so the application making the change to the file does not have to wait for the disk write to complete before proceeding More than one page can be transferred on each write operation Frequency the Cache's Lazy Write thread has written to disk Lazy Writing is the process of updating the disk after the page has been changed in memory, so the application making the change to the file does not have to wait for the disk write to complete before proceeding More than one page can be transferred on a single disk write operation Percentage of Cache Memory Descriptor List (MDL) Read requests that hit the Cache, ie, did not require disk accesses in order to provide memory access to the page(s) in the Cache Frequency of reads from Cache pages that use a Memory Descriptor List (MDL) to access the data The MDL contains the physical address of each page involved in the transfer, and thus can employ a hardware Direct Memory Access (DMA) device to effect the copy The LAN Server uses this method for large transfers out of the server SYS-ED \COMPUTER EDUCATION TECHNIQUES, INC (W2000 Server - 36) APP E: Page iv

6 Pin Read Hits Pin Reads Read Aheads Sync Copy Reads Percentage of Cache Pin Read requests that hit the Cache, ie, did not require a disk read in order to provide access to the page in the Cache While pinned, a page's physical address in the Cache will not be altered The LAN Redirector uses this method for retrieving Cache information, as does the LAN Server for small transfers This is usually the method used by the disk file systems as well Frequency of reading data into the Cache preparatory to writing the data back to disk Pages read in this fashion are pinned in memory at the completion of the read While pinned, a page's physical address in the Cache will not be altered Frequency of Cache reads where the Cache detects sequential access to a file The read aheads permit the data to be transferred in larger blocks than those being requested by the application, reducing the overhead per access Frequency of reads from Cache pages that involve a memory copy of the data from the Cache to the application's buffer The file system will not regain control until the copy operation is complete, even if the disk must be accessed to retrieve the page SYS-ED \COMPUTER EDUCATION TECHNIQUES, INC (W2000 Server - 36) APP E: Page v

7 23 ICMP Object: s Messages Outbound Errors Messages Received Errors Messages Received Messages Sent Messages Received Address Mask Received Address Mask Reply Received Destination Unreachable Received Echo Reply Received Echo Received Parameter Problem Received Redirect Received Source Quench Received Time Exceeded Received Timestamp Reply Received Timestamp Sent Address Mask is Sent Address Mask Reply Sent Destination Unreachable Sent Echo Reply Sent Echo ICMP messages that this entity did not send due to problems discovered within ICMP such as lack of buffers This value should not include errors discovered outside the ICMP layer such as the inability of IP to route the resultant datagram In some implementations there may be no types of error that contribute to this counter's value Number of ICMP messages that the entity received but determined as having errors (bad ICMP checksums, bad length, etc) Rate that ICMP messages are received by the entity The rate includes those messages received in error Rate that ICMP messages are attempted to be sent by the entity The rate includes those messages sent in error Total rate that ICMP messages are received and sent by the entity The rate includes those messages received or sent in error Number of ICMP Address Mask Request messages received Number of ICMP Address Mask Reply messages received Number of ICMP Destination Unreachable messages received Rate of ICMP Echo Reply messages received Rate of ICMP Echo messages received Number of ICMP Parameter Problem messages received Rate of ICMP Redirect messages received Number of ICMP Source Quench messages received Number of ICMP Time Exceeded messages received Rate of ICMP Timestamp Reply messages received Rate of ICMP Timestamp (request) messages received Number of ICMP Address Mask Request messages sent Number of ICMP Address Mask Reply messages sent Number of ICMP Destination Unreachable messages sent Rate of ICMP Echo Reply messages sent Rate of ICMP Echo messages sent SYS-ED \COMPUTER EDUCATION TECHNIQUES, INC (W2000 Server - 36) APP E: Page vi

8 Sent Parameter Problem Sent Redirect Sent Source Quench Sent Time Exceeded Sent Timestamp Reply Sent Timestamp Number of ICMP Parameter Problem messages sent Rate of ICMP Redirect messages sent Number of ICMP Source Quench messages sent Number of ICMP Time Exceeded messages sent Rate of ICMP Timestamp Reply messages sent Rate of ICMP Timestamp (request) messages sent Additional counters will be examined and demonstrated specific to the client s operational objectives SYS-ED \COMPUTER EDUCATION TECHNIQUES, INC (W2000 Server - 36) APP E: Page vii

Appendix PERFORMANCE COUNTERS SYS-ED/ COMPUTER EDUCATION TECHNIQUES, INC.

Appendix PERFORMANCE COUNTERS SYS-ED/ COMPUTER EDUCATION TECHNIQUES, INC. Appendix E PERFORMANCE COUNTERS SYS-ED/ COMPUTER EDUCATION TECHNIQUES, INC. Performance s 1 Default s for Commonly Used Objects Object Default Cache Data Map Hits % How often requested data is found in