02/28/85 system_link_meters Syntax as a command: system_link_meters {-control_arg} Function: prints out system-wide statistics regarding usage of the Multics linker. Information is obtained from the active_hardcore_data and tc_data data bases. Control arguments: -report_reset, -rr generates a full report and then performs the reset operation. -reset, -rs resets the metering interval for the invoking process so that the interval begins at the last call with -reset specified. If -reset has never been given in a process, it is equivalent to having been specified at system initialization time. Access required: This command requires access to phcs_ or metering_gate_. Notes: If the system_link_meters command is given with no control argument, it prints a full report. Statistics are given for overall use of the linker, and are also broken down by task. The three major tasks of the linker are listed below. 1. Searching the definition section of the object segment for the symbolic name of the referenced segment. 2. Searching for the segment using the standard search rules. 3. Getting the linkage to the referenced segment. The following are brief descriptions of the variables printed out by the system_link_meters command. CPU Metering time is the amount of time for which the processor was busy. It equals total processor time minus idle time. Total time in linker is the total amount of CPU time spent in the linker, expressed as hh:mm:ss. Average time per link is the average time to completion (in milliseconds) for a call to the linker. Percentage of real time in linker is the percentage of total metering time that was spent in the linker. Percentage of CPU is the percentage of virtual CPU metering time that was spent in the linker. Time Slot are the time slots into which calls to the linker are broken down. The four slots are for calls completed in less than 25 milliseconds, calls completed in between 25 and 50 ms, calls completed in between 50 and 75 ms, and calls completed in more than 75 ms. Calls is the number of calls that were completed in each time slot. Total time in slot is the total amount of virtual CPU time taken by calls in each time slot. Percent total time is the percentage of the virtual CPU time spent in the linker that was taken by calls in each slot. Percent total calls is the percentage of calls to the linker that fell into each time slot. Average time is the average time (in milliseconds) to complete a call to the linker that ended up in each time slot. Average page faults is the average number of page faults for a call in each slot. The following statistics are given for each of the three major tasks of the Multics linker: definition search, segment search, and get linkage. Average time is the average time (in milliseconds), for a call in each slot, spent on that particular function of the linker. Average page faults is the average number of page faults for a call in each slot, which occurred during that particular task of the linker. Percent time in slot is the percentage of the total time spent in the slot that was taken up by that particular task. These percentages do not add up to 100% because some time used by the linker does not fit into any of the three categories. ----------------------------------------------------------- Historical Background This edition of the Multics software materials and documentation is provided and donated to Massachusetts Institute of Technology by Group BULL including BULL HN Information Systems Inc. as a contribution to computer science knowledge. This donation is made also to give evidence of the common contributions of Massachusetts Institute of Technology, Bell Laboratories, General Electric, Honeywell Information Systems Inc., Honeywell BULL Inc., Groupe BULL and BULL HN Information Systems Inc. to the development of this operating system. Multics development was initiated by Massachusetts Institute of Technology Project MAC (1963-1970), renamed the MIT Laboratory for Computer Science and Artificial Intelligence in the mid 1970s, under the leadership of Professor Fernando Jose Corbato. Users consider that Multics provided the best software architecture for managing computer hardware properly and for executing programs. Many subsequent operating systems incorporated Multics principles. Multics was distributed in 1975 to 2000 by Group Bull in Europe , and in the U.S. by Bull HN Information Systems Inc., as successor in interest by change in name only to Honeywell Bull Inc. and Honeywell Information Systems Inc. . ----------------------------------------------------------- Permission to use, copy, modify, and distribute these programs and their documentation for any purpose and without fee is hereby granted,provided that the below copyright notice and historical background appear in all copies and that both the copyright notice and historical background and this permission notice appear in supporting documentation, and that the names of MIT, HIS, BULL or BULL HN not be used in advertising or publicity pertaining to distribution of the programs without specific prior written permission. Copyright 1972 by Massachusetts Institute of Technology and Honeywell Information Systems Inc. Copyright 2006 by BULL HN Information Systems Inc. Copyright 2006 by Bull SAS All Rights Reserved