Changes between Version 99 and Version 100 of processus_thread


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Timestamp:
Jun 25, 2018, 3:30:20 PM (7 years ago)
Author:
nicolas.van.phan@…
Comment:

Fix typos

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  • processus_thread

    v99 v100  
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    5 The process is the internal représentation of an user application. A process can be running as a single thread (called main thread), or can be multi-threaded. ALMOS-MKH supports the POSIX thread API.
     5The process is the internal representation of a user application. A process can be running as a single thread (called main thread), or can be multi-threaded. ALMOS-MKH supports the POSIX thread API.
    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
    … …  
    1414As ALMOS-MKH supports process migration, the '''reference cluster''' can be different from the '''owner cluster'''. The '''owner cluster''' cannot change (because the PID is fixed), but the '''reference cluster''' can change in case of process migration.
    1515
    16 In each cluster K, the local cluster manager ( cluster_t  type in ALMOS-MKH ) contains a process manager ( pmgr_t  type in ALMOS-MKH ) that maintains three structures for all process owned by K :
     16In each cluster K, the local cluster manager ( cluster_t  type in ALMOS-MKH ) contains a process manager ( pmgr_t  type in ALMOS-MKH ) that maintains three structures for all processes owned by K :
    1717 * The '''PREF_TBL[lpid]''' is an array indexed by the local process index. Each entry contains an extended pointer on the reference process descriptor.
    1818 * The '''COPIES_ROOT[lpid]''' array is also indexed by the local process index. Each entry contains the root of the global list of copies for each process owned by cluster K.   
    … …  
    2525 * '''KILLED''' : the process received a SIGKILL signal. It will be destroyed by the parent process executing a wait() sys call.
    2626
    27 You can find below a partial list of informations stored in a process descriptor ( process_t  in ALMOS-MKH ):
     27You can find below a partial list of information stored in a process descriptor ( process_t  in ALMOS-MKH ):
    2828- '''PID''' :  proces identifier.
    2929- '''PPID''' : parent process identifier,
    … …  
    5656To scan the set off all threads of a process P, ALMOS-MKH traverse the COPIES_LIST of all process_descriptors associated to P process.
    5757
    58 This implementation of ALMOS-MKH does not support thread migration: a thread is pinned on a given core in a given cluster. In the future process migration mechanism, all threads of given process in a given cluster can migrate to another cluster for load balancing. This mechanism is not implemented yet (february 2018), and will require to distinguish the kernel thread identifier (TRDID, that will be modified by a migration), and the user thread identifier (THREAD, that cannot be modified by a migration). In the current implementation, the user identifier (returned by the pthread_create() sys call, is identical to the kernel identifier.
     58This implementation of ALMOS-MKH does not support thread migration: a thread is pinned on a given core in a given cluster. In the future process migration mechanism, all threads of given process in a given cluster can migrate to another cluster for load balancing. This mechanism is not implemented yet (february 2018), and will require to distinguish the kernel thread identifier (TRDID, that will be modified by a migration), and the user thread identifier (THREAD, that cannot be modified by a migration). In the current implementation, the user identifier (returned by the pthread_create() sys call), is identical to the kernel identifier.
    5959
    60 You can find below a partial list of informations stored in a thread descriptor (thread_t in ALMOS-MKH):
     60You can find below a partial list of information stored in a thread descriptor (thread_t in ALMOS-MKH):
    6161 * '''TRDID''' : thread identifier
    6262 * '''TYPE''' : KERNEL / USER / IDLE / RPC