v01n05
Contents
1. time sharing jobs if the user program is greater thatn 2000 lines If other changes are made to PASCAL it may get even longer Therefore one overriding change is to shrink the size of the compiler Other changes will not be to the language but instead will restore features present in the old compiler l Print an error message summary at the bottom of the listing 2 Implement a value initialization facility Work will be done in creating a TELEX PASCAL subsystem SNOBOL needs to be changed to flush the OUTPUT buffer on time limit abort and to perform EREXIT recovery A Mickel Kevin Matthews proposes to write a new PP program which would be used exclusively to gather operating system statistics such as queue sizes RA 1 requests rollouts and rotary usage statistics As stated in a memo by Andy Mickel and John Strait dated 75 05 01 the present STATISTICS dayfile message LOCP is meaningless in regards to many CALLPRG program usage Tom Lanzatella proposes to modify program 1AJ to output another message to the STATISTICS dayfile The new message would be prefixed by LOOV and would appear whenever LDR loads a 0 0 overlay Jim Foster has suggested that the current reprieve time granted after a TIME LIMIT abort is far too large at 20 seconds Jim has suggested that 4 seconds would be more appropriate The code necessary for this change is minimal however the amount of user education is large requiring both SYSNOTES and NEWSLETTER articl2. UNIVERSITY OF MINNESOTA COMPUTER CENTER Deadstart Systems Newsletter 15 July 1975 Vol 1 No 5 Send all comments criticisms and contributions to the editor T W Lanzatella NOTICE OF CHANGES TO THE OPERATING SYSTEM The following changes will go into production on 17 July 1975 N L Reddy contributed the following modifications 1 Program 1CJ now saves the length of OUTPUT files in the system sector 2 Program 1CJ writes a message to the user dayfile whenever a non primary OUTPUT PLOT or PUNCH file is released to the queue The format of the new message is RELEASED TO QT PRU COUNT 1fn where QT is a queue type 3 Program 1BA was modified to output on extra line of information on the banner page The new line gives the length of the job output file in decimal KPRU s Additionally program 1BA now builds a page eject into output file banner pages Previously the function was performed by 1CD through format channel selection 4 The recent security violation prompted the following fix to LDQ DMQ In KRONOS 2 1 2 the LDQ DMQ utilities are renamed to QLOAD and QDUMP The new programs are also restructured into 0 1 overlays and all queue load dump commands are preprocessed by a new program QFSP This new program QFSP has been imple mented and the programs QLOAD and QDUMP previously LDQ and DMQ have code which checks for system origin requests 5 A new feature of the 2 1 2 QLOAD QDUMP is that the FI field on t Comp tape lab
3. els is now the date on which the dump was taken Alan Johnston supplied a new feature and a level 9 fix to the job scheduler The mod adds two new parameters to the SERVICE command for DSD and to the IPRDECKS The first new parameter QP sets the queue priority for a job scheduled to a control point This priority is set only when the scheduling of the job does not exceed the AM parameter or if the current priority in the INPUT ROLLOUT queue is lower than the job s origin QP The second new parameter CT sets the category that the jobs origin is placed in when the job scheduler counts available memory This is used to group sets of origins together for the AM parameter The value of CT should be set between zero and MXOT 1 If the value of CT is set at or above MXOT then the scheduler treats the catagory as zero Don Hamnes modified DISPOSE so that the lengthofaDISPOSEd file is stored in the file system sector Marisa Riviere delivered a final version of RFM for inclusion in the system program libraries Bill Elliott contributed the following modifications 1 Because specifying NS O on a LABEL card causes IMT to hang NS 1 is forced 2 Because removable pack jobs perform sluggishly in the timed event queue Bill has modified MAGNET to get these jobs to roll in on event This modification also allows jobs active on a removable device to complete while locking out new jobs if an UNLOAD has been performed on the device 3 Add in
4. es Tom Lanzatella will insure that the change is implemented by the second Thursday in August and that the necessary articles are written and published in the UCC NEWSLETTER es will be published during the first week of August SYSTEM MAINTENANCE PROCEDURES AND PEOPLE Deadstart Tape and Deadstart Systems Newsletter schedule The following DST DSN schedule was proposed and accepted by the Systems Group 5 Deadstart tapes are written on the first and third Tuesdays of each month The deadline for submission of mods for inclusion in the system is the first and third Monday of each month No modifications will be accepted without a written report explaining the purpose and function of the modification Operating System program libraries maintained under user number LIBRARY will be updated as soon as the deadstart tape is determined to be operational The Deadstart Systems Newsletter will be published on the second and fourth Tuesday of each month and a new deadstart tape will be implemented on the second and fourth Thursday of each month The recent security violation caused by sly and malicious use of the DMQ LDQ utility has prompted an immediate change in the catalog type of all permanent files accept CPL maintained under user number library pack name STF and SYSTEM These files are all PRIVATE files PERMITted to selected staff members If you have a need to access these files contact Tom Lanzatella SUMMER PROJECTS SUMMARY A M
5. formation to the E P display to inform operators how many resources a job is requesting and to get jobs with resources already in use out of the system faster 4 A modification which may help to make LB NS operational 5 A modification which disables internal requests for tapes and disks for jobs with TXOT origin l The following report is due to Kevin Matthews and describes the modifications which he introduced to the operating system I Mod PPRBIN Binary search of PP programs A mod called PPRBIN adds a CPU monitor function SPLM which searches the PPU Peripheral Library Directory This mod has been in the system on a test basis for several months and has performed satisfactorily Tests indicate that it significantly shortens by 3 milliseconds out of 11 milliseconds the load time for an ECS resident PP overlay The monitor function adds about 403 words to CPUMTR but the Central Memory Resident portion of KRONOS is no longer because PP program SFP Scope Function Processor can be removed from Central Memory to ECS or disk The monitor function can optionally collect statistics on PP overlays loaded The following routines are affectd PPR to use function SPLM in overlay load routine CPUMTR to add SPLM monitor function SYSEDIT to sort PP library table for binary search delete CDC code for SFP SLL to delete CDC special code for SFP COMDTFN to document new function SPLM PPTEXT to define new functi
6. he ENABLE DISABLE bits for various console controllable options These nine bits select PMS options They can be controlled from the console by ENABLE PMSXX DISABLE PMSXX where XX is an octal number between 0 and 10B These bits may also be toggled by the IPRDECK commands PMS XX at deadstart time Currently only PMS bit 00 is used If this option is enabled a statistics dayfile message is issued for each job rollout The remaining bits will be controlled by K C Matthews Programmers should not add options which depend on these bits without coordinating the mod through KCM The following routines were modified PPTEXT to define statistics pointer word in low core MSP to define PMS options in SSTL CPUMTR MIR to gather statistics SLL to clear PP overlay load table after a SYSEDIT IRI IRO to gather rollin rollout statistics SET to generate word PMSP in low core to implement PMS CMRDECK command to implement PMS IPRDECK command DSD to add ENABLE DISABLE PMS commands Mod MTRFCN Mod MTRFCN generalizes commom deck PPCOM so that new monitor functions can be properly defined Mod CPMTUI This is a permanent change to CPUMTR to prevent track zero from being dropped by an errant PP program Mod FREEBE changes mod FREEBE That mod defined the FRE entry point which specifies that the job will not be charged CP time or PRU s transferred for the FRE program RESEX is the only FRE This mod wa
7. ickel Below is a brief description of summer projects currently occupying the Systems Groups time Data is primarily from the July 10 1975 Systems Group meeting although some information comes from the meetings of May 22 June 12 and June 26 The target dates are September 1 or fall quarter unless otherwise noted The order of people presented is that of seating position in the last meeting persons not present or deceased are last We Elliott Nine track tape work Tape use document MF501 N Reddy Bring size of EXPORT down from 11K Aim toward stability help in documentation Implement I O Queue protection from KRONOS 2 1 2 B Johnson Work with Don McCullough on SUPIO protocol for minicomputers Gather PDP 11 statistics formerly a well kept secret Develop maintenance routines T Salo Work on Dump Queue Load Queue QFM cored Tk y Recover Permanent files from crashed disks routine Enhance loading of indirect permanent files by chain Work on Reblock Version III both ways verifying Gap eats stranger tape writer pack up records PE FORTRAY RINNAS FoR ETN 4 unne REGRO WAPAGSS K Matthews Do documentation KRONOS 2 1 Manuals Update permanent file document with TWL and DRL Work on PF incremental dumps procedures Implement password hashing for MODVAL Operator drop messages STE ECS rollout winter quarter CKP RESTART fix to include ECS T Lanzatella Deadstart Systems Newsletter Documentation with KCM and DRL He
8. lp reorganize mod scheme a Rotary timesharing usage statistics srry 1 1AJ 0 0 overlay loader messages for statistics s6 D Hamnes M Riviere Bs Stahl H Kurs A Mickel B Williams J Eikum J Strait S Lenz J Mundstock A Johnston A Nonymous deceased PLONE Relocatable loader statistics common loader January Queue file PP routines work Convert MIMIC for FIN calling sequence Identify CALLPRG files New procedures for changing library tape for CDC compilers and libraries i l Put in ALGOL 3 timesharing mods when ready New policy on MNF versions FETCH MNF Heavy bug investigation MNF compiler work Record Manager Short Course Level 8 and 9 of Record Manager FTN4 and COBOL4 for September PASCAL and SNOBOL short courses done SNOBOL files and documentation PASCAL and LISP documentation Dayfile statistics for language processor usage User s Manual chapters 3 5 and 6 Cyber Loader Merging Meritss and Mirje Merging Meritss and Mirje SPHEM EPROENG LEVEL Y PASCAL subsystem on Mirje PASCAL compiler work Finish MIXAL documentation Put up UTALGOL Work on ALGOL3 timesharing mods General MNF work CALLPRG work Implement Fortran Common Library FCL for FTN Record Manager and MNF winter Dayfile output limits from Procedures files Fimesharing Usage Statisiics PP routine to monitorP register SPY SNP snap dump
9. on SPLM to delete references to CDC special SFP words SFP changed to handle new entry conditions required by other changes II Mod PMS During spring quarter I put a hodgepodge of changes into the system to collect performance measurement statistics I now want to formalize this data collect ion and have a consistent scheme for collecting performance measurement data This data will be especially helpful when we get the 808 disks I hope we can try various arrangements of file assignments and use the data to decide which arrangement helps throughput the most As a first step I have introduced a mod called PMS Performance Measurement Statistics This mod defines a table in Central Memory which holds measure he IIL IV ment data The entries in this table are defined in a new common deck COMSPMS The largest areas in the table are those used for collecting PP overlay load counts and Monitor Function Usage These areas take up 754B words of central memory One feature of the modset is that these tables need not be in core One can enter in the CMRDECK PMS XXXX where XXXX is the octal length of the performance measurement statistics area The length cannot be less than a minimum required value currently 30B If the PMS table is not long enough for the measurement of certain items they are simply not gathered Nine bits have been defined in the system status word USSTL 43B in low core This word holds t
10. s changed so that the uncharged CPU time is charged at the SYSTEM control point es VI Mod ISFUI Modifies deck ISF to test for proper positioning of the CEJ MEJ switch as previously suggested in a memo to the Systems Group VIL Mod CIOUL This mod makes it illegal for CIO to write on track 0 of any mass storage device It was in the system when track 0 was being destroyed in May Since it requires very little overhead in CIO it is being added as a permanent mod to help spot future system malfunctions VIII Mod 1CKUL This mod to 1CK is already in the system It now becomes a permanent mod The mod adds two features to the code that writes the TRT on a permanent file device 1 The TRI is verified to make sure that the label track of the device is still intact It can help prevent the permanent file catalog tracks from being destroyed although damage may be irrecoverable by the time 1CK is called 2 An extra copy of the TRT is kept on an unused cylinder of 844 devices This makes it possible to recover the TRT in some cases IX Mod KLGO010 This mod is a Kludge and is already in the system It checks the direct access file chains and the indirect access data chain on permanent file devices We hope to find the permanent file problems of June with this mod Since extensive overhead is added to the CPUMTR code for dropping track chains this mod should not be considered permanent Routines affected CPUMTR Check tha
11. t the first track of a chain being dropped is not in any permanent file chain 1CK Verify that all permanent file chains terminate with a proper EOI byte PFM Clear direct access bit when purging direct access files to interface properly with the CPUMTR change above PROPOSED CHANGES TO THE OPERATING SYSTEM Reader of the DSN are directed to two important documents published recently which will not be reprinted in the DSN due to their size The first is a collection of memos by Kevin Matthews which propose 1 The afore mentioned change to ISF to check for the CEJ MEJ option when deadstarting the CYBER 74 2 That the DISPOSE utility be renamed to ROUTE and that a separate ROUTE program and macro be written so as to simplify maintenance and documentation of the utility 3 In the light of all of the accumulated local changes to the permanent file FET the FET should be expanded reorganized and documented to simplify implementation of KRONOS 2 1 2 The second document is the product of the ad hoc committee on documentation standards The proposals set forth in that document have been accepted by the executive committee and all individuals concerned are working on their respective assignments As the proposals become reality guidelines will be published in the DSN PASCAL and SNOBOL Below are listed proposed changes to PASCAL and SNOBOL to be implemented September 1 PASCAL currently suffers from too long a field length for
Download Pdf Manuals
Related Search