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New -zisofs parameters bpt_target=

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Thomas Schmitt
2020-10-17 15:30:26 +02:00
parent 2f44446d05
commit 3f390f2cdc
11 changed files with 6092 additions and 73 deletions
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20
xorriso/xorriso.texi
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@ -50,7 +50,7 @@
@c man .\" First parameter, NAME, should be all caps
@c man .\" Second parameter, SECTION, should be 1-8, maybe w/ subsection
@c man .\" other parameters are allowed: see man(7), man(1)
@c man .TH XORRISO 1 "Version 1.5.3, Oct 14, 2020"
@c man .TH XORRISO 1 "Version 1.5.3, Oct 16, 2020"
@c man .\" Please adjust this date whenever revising the manpage.
@c man .\"
@c man .\" Some roff macros, for reference:
@ -3642,15 +3642,27 @@ zisofs compressed files.
@*
"block_size_v2="32k|64k|128k|256k|512k|1m sets the size of compression blocks
for zisofs2.
@*
"bpt_target="-1|>0 sets a number of block pointers per file, which is
considered low enough to justify a reduction of block size. If this number is
larger than 0, then block sizes smaller than the settings of block_size= or
block_size_v2= are tried whether they yield not more block pointers than the
given number. If so, the smallest suitable block size is applied.
@*
The inavoidable final block pointer counts. E.g. a file of 55 KiB has 3 block
pointers if block size is 32k, and 2 block pointers with block size 64k.
@*
bpt_target=-1 disables this automatic block size adjustment.
@*
"max_bpt="1k|...|128g sets the limit for the overall allocated block pointer
memory. Block pointers occupy virtual memory while a file gets uncompressed
and while a file, which shall be compressed, waits for ISO filesystem creation.
@*
One pointer occupies 8 bytes of memory and governs block_size or block_size_v2
uncompressed bytes.
I.e. with block size 128k, 1m of block pointer memory suffices for 16g of
uncompressed file size.
uncompressed bytes. I.e. with block size 128k, 1m of block pointer memory
suffices for at most 16g of uncompressed file size. Each file consumes one end
block pointer, independently of the file size. Partially filled end blocks
may further reduce the effective payload.
@*
"max_bpt_f="1k|...|128g sets the limit for the memory size of the block
pointer list of a single file. max_bpt_f is never larger than max_bpt.