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In case of ISO_ZISOFS_TOO_MANY_PTR remove all dispensable block pointers

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Thomas Schmitt
2020-10-25 17:04:24 +01:00
parent 396d09946e
commit c1e6d3415a
6 changed files with 120 additions and 86 deletions
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21
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 21, 2020"
@c man .TH XORRISO 1 "Version 1.5.3, Oct 25, 2020"
@c man .\" Please adjust this date whenever revising the manpage.
@c man .\"
@c man .\" Some roff macros, for reference:
@ -3654,7 +3654,7 @@ 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
"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.
@*
@ -3664,22 +3664,27 @@ 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
In case of overflow of the max_bpt limit while adding compression filters
the program tries to go on by discarding all buffered block pointers of
previously added --zisofs filters. From then on all newly added filters will
discard their block pointers immediately after being added.
Discarded block pointers cause an additional read and compression run of the
input file during the production of the ISO filesystem.
@*
"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.
If either is set to violate this rule, the other gets set to the same value.
If both values are the same before a change by max_bpt= or max_bpt_f=, then
both limits stick together unless the limit is decreased by max_bpt_f=.
@*
"bpt_free_ratio="-1|[0.0...1.0] sets a threshold for switching to block
"bpt_free_ratio="-1|0.0...1.0 sets a threshold for switching to block
pointer discarding during compression. If less than the given fraction of the
max_bpt_f= memory is free, then block pointers of compression filters get
discarded after size assessment. This causes a third read run of the input
file during the production of the ISO filesystem. Value -1 disables this
feature.
discarded immediately after being added. Value -1 disables this feature.
@*
"default" is the same as "level=6:block_size=32k:by_magic=off:
version_2=off:block_size_v2=128k:max_bpt=256m:max_bpt_f=256m:
bpt_free_ratio=0.5".
bpt_free_ratio=-1".
@c man .TP
@item -speed code|number[k|m|c|d|b]
@kindex -speed set write speed