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04c1417602
Sometimes ARG_MAX is small (like 32k) yet sysconf(_SC_ARG_MAX) is big, and people prefer using the bigger value. OTOH, with sufficiently large ARG_MAX, further wins from sysconf(_SC_ARG_MAX) being bigger are exponentially smaller: you can see 4 times fewer fork+execs when you run find, but when each execed process already takes a thousand parameters it's likely execution time is dominated by what that process does with each parameter. Thus, with this change ARG_MAX is used if it's sufficiently big, otherwise sysconf(_SC_ARG_MAX) is used. Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
23 lines
460 B
C
23 lines
460 B
C
/* vi: set sw=4 ts=4: */
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/*
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* Various system configuration helpers.
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*
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* Copyright (C) 2014 Bartosz Golaszewski <bartekgola@gmail.com>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
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#include "libbb.h"
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#if !defined(bb_arg_max)
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unsigned FAST_FUNC bb_arg_max(void)
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{
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return sysconf(_SC_ARG_MAX);
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}
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#endif
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/* Return the number of clock ticks per second. */
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unsigned FAST_FUNC bb_clk_tck(void)
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{
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return sysconf(_SC_CLK_TCK);
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}
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