From 562e7ed1ed282d9e6ecc50a228359bf35e5adec5 Mon Sep 17 00:00:00 2001 From: Joel Sherrill Date: Fri, 11 Feb 2000 15:54:47 +0000 Subject: Increased block size to 128 and added comments based on feedback from Java folks including Oscar Martinez de la Torre . --- c/src/lib/libc/imfs.h | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-) (limited to 'c/src/lib/libc') diff --git a/c/src/lib/libc/imfs.h b/c/src/lib/libc/imfs.h index 585c070594..38c770a325 100644 --- a/c/src/lib/libc/imfs.h +++ b/c/src/lib/libc/imfs.h @@ -66,9 +66,21 @@ typedef struct { * * block_ptr is a pointer to a block of IMFS_MEMFILE_BYTES_PER_BLOCK in * length which could be data or a table of pointers to blocks. + * + * Setting IMFS_MEMFILE_BYTES_PER_BLOCK to different values has a significant + * impact on the maximum file size supported as well as the amount of + * memory wasted due to internal file fragmentation. The following + * is a list of maximum file sizes based on various settings + * + * max_filesize with blocks of 16 is 1,328 + * max_filesize with blocks of 32 is 18,656 + * max_filesize with blocks of 64 is 279,488 + * max_filesize with blocks of 128 is 4,329,344 + * max_filesize with blocks of 256 is 68,173,568 + * max_filesize with blocks of 512 is 1,082,195,456 */ -#define IMFS_MEMFILE_BYTES_PER_BLOCK 64 /* 512 */ +#define IMFS_MEMFILE_BYTES_PER_BLOCK 128 #define IMFS_MEMFILE_BLOCK_SLOTS \ (IMFS_MEMFILE_BYTES_PER_BLOCK / sizeof(void *)) -- cgit v1.2.3