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Status Delivered
Categories z/TPF
Created by Guest
Created on Nov 19, 2014

OPENSOURCE CODE PERFORMANCE IMPROVEMENTS

Opensource code performance improvements are needed in CPP1 to
eliminate unnecessary copy-on-write during shared object
initialization, plus improve performance of strchr/memchr and
string.h.

Idea priority High
  • Guest
    Reply
    |
    Oct 14, 2015

    Due to processing by IBM, this request was reassigned to have the following updated attributes:
    Brand - Servers and Systems Software
    Product family - z Systems Software
    Product - z/TPF

    For recording keeping, the previous attributes were:
    Brand - WebSphere
    Product family - Transaction Processing
    Product - z/TPF

  • Guest
    Reply
    |
    Jan 23, 2015

    This is delivered with PJ42733 on z/TPF PUT12.

  • Guest
    Reply
    |
    Nov 19, 2014

    Two updates are identified:
    1)eh_globals.cc updates to eliminate COW on soinit functionality.
    2)string.h TPF-specific functionality for strchr:
    __BEGIN_NAMESPACE_STD
    #if defined _TPF_SOURCE && !defined __SYSC__
    /* Find the first occurrence of C in S. */
    extern inline char *strchr (__const char *__s, int __c) __THROW {
    return (char *)memchr((void *)__s, __c, __builtin_strlen(__s) + 1);
    }

    ... results in two stsr assembler instructions being created; one to find the end of the string S, the other to find the character C in question. This ends up being inefficient for xml files that tend to average 250K bytes but can easily be 1 million or more bytes long. The recommendation here is to remove this TPF only modification and similar str* functions that call corresponding mem* functions with a strlen() as the last parm: strcpy, strncpy, strcat, strncat.