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| author | B. Watson <urchlay@slackware.uk> | 2025-12-01 04:37:29 -0500 |
|---|---|---|
| committer | B. Watson <urchlay@slackware.uk> | 2025-12-01 04:37:29 -0500 |
| commit | 313050769f98ad6159f7399e5418d6608be5c531 (patch) | |
| tree | 0b376dcb274d699465e23e01dcce3159fc9a5eda /src/alf.1 | |
| parent | 4842123935ecdf55e322d8661366d55ad77ab2a8 (diff) | |
| download | alftools-313050769f98ad6159f7399e5418d6608be5c531.tar.gz | |
Update performance section in alf man page.
Diffstat (limited to 'src/alf.1')
| -rw-r--r-- | src/alf.1 | 22 |
1 files changed, 13 insertions, 9 deletions
@@ -27,7 +27,7 @@ level margin: \\n[rst2man-indent\\n[rst2man-indent-level]] .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]] .in \\n[rst2man-indent\\n[rst2man-indent-level]]u .. -.TH "ALF" 1 "2025-11-29" "0.2.1" "Urchlay's Atari 8-bit Tools" +.TH "ALF" 1 "2025-12-01" "0.2.1" "Urchlay's Atari 8-bit Tools" .SH NAME alf \- create Atari 8-bit ALF archives .\" RST source for alf(1) man page. Convert with: @@ -195,14 +195,18 @@ compress/decompress such files, and you\(aqd have to have a hard disk and a DOS capable of handling multi\-megabyte files... .SS Performance .sp -Performance is \fIhorrible\fP\&. This shouldn\(aqt be a real problem on -modern multi\-GHz CPU, especially since most Atari 8\-bit files are -small (usually under 64KB). Interestingly, it\(aqs not O(n^2), it scales -linearly, O(1): Compressing a 1.3MB text file takes 0.7 seconds on the -author\(aqs (rather modest) Intel i7 workstation, and a file 10x as large -takes approximately 10x as long (7 seconds). A 50KB file is almost -instantaneous, 0.05 seconds, which is more typical of the files you\(aqd -actually use this with. +Performance is pretty good, as of alftools\-0.3.0. For small files +like you\(aqd use on an Atari (up to 50KB), it\(aqs basically instantaneous +(under 0.02 seconds) on the author\(aqs modest i7 workstation. For a 1MB +text file, it takes 0.05 sec; for 1MB of random garbage, it\(aqs 0.1 +sec (and the resulting ALF file is 36% larger than the garbage). +.sp +By comparison, \fBzip\fP takes 0.6 seconds to compress the 1MB text file, +and 0.03 sec for the 1MB randomness (and the compressed file is still +larger than the input, but only by 312 bytes). The speed demon is \fBarc\fP: +it compresses the text file in 0.03s, and it\(aqs smart enough to \fInot\fP +compress the random garbage (it uses the \(aqstore\(aq method, which \fBalf\fP +doesn\(aqt have). .SS Timestamps .sp The date/time stamps stored in the archive are the \fBmtime\fPs of the |