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bonnie reports that char i/o with glibc 2 is much slower than with libc5. What can be done?

April 26, 2017bonnie char glibc libc5 reports slower

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bonnie reports that char i/o with glibc 2 is much slower than with libc5. What can be done?

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{AJ} The GNU C library uses thread safe functions by default and libc5 used non thread safe versions. The non thread safe functions have in glibc the suffix `_unlocked’, for details check . Using `putc_unlocked’ etc. instead of `putc’ should give nearly the same speed with bonnie (bonnie is a benchmark program for measuring disk access).