Changes between Version 84 and Version 85 of processus_thread


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Timestamp:
Mar 1, 2018, 12:59:07 PM (7 years ago)
Author:
alain
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  • processus_thread

    v84 v85  
    66For a multi-threaded application, the number of threads can be very large, and the threads of a given process can be distributed on all cores available in the shared memory architecture, for maximal parallelism. Therefore, a single process can spread on all clusters. To avoid contention, the process descriptor of a P process, and the associated structures, such as the list of registered vsegs ('''VSL'''), the generic page table ('''GPT'''), or the file descriptors table ('''FDT''')  are  (partially) replicated in all clusters containing at least one thread of P.
    77
    8 == __1) Process__ ==
     8== __1) Process definition__ ==
    99
    1010The PID (Process Identifier) is coded on 32 bits. It is unique in the system, and has a fixed format:  The 16 MSB (CXY) contain the owner cluster identifier. The  16 LSB bits (LPID) contain the local process index in owner cluster. The '''owner cluster''' is therefore defined by the 16 MSB bits of PID.
    … …  
    4141All elements of a ''local'' list are in the same cluster, and ALMOS-MKH uses local pointers. Elements of a ''global'' list can be distributed on all clusters, and  ALMOS-MKH uses extended pointers. 
    4242
    43 == __2) Thread__ ==
     43== __2) Thread definition__ ==
    4444
    4545ALMOS-MKH defines four types of threads :