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<?php $m1 = str_repeat("\x80", 32); $m2 = str_repeat("\x80", 33554432); $end1 = $end2 = $start = microtime(true); $hash1 = hash('sha256', $m1); $end1 = microtime(true); $hash2 = hash('sha256', $m2); $end2 = microtime(true); var_dump( number_format($end1 - $start, 5), number_format($end2 - $start, 5) );
Output for git.master, git.master_jit
Fatal error: Out of memory (allocated 2097152 bytes) (tried to allocate 33554464 bytes) in /in/8tjrs on line 4 mmap() failed: [12] Cannot allocate memory mmap() failed: [12] Cannot allocate memory
Process exited with code 255.

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