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Handler for instant reads and writes
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Patrik Axelsson b72c125dd9 Removed ppc-warpup from Architecture :)
2025-11-23 00:59:06 +01:00
.gitignore Add debug versions for all platforms 2025-11-22 13:52:29 +01:00
Debug.c Add MorphOS AmigaOS4 and AROS-i386 versions 2025-11-12 00:51:05 +01:00
Debug.h Add debug versions for all platforms 2025-11-22 13:52:29 +01:00
Makefile Add debug versions for all platforms 2025-11-22 13:52:29 +01:00
NOP-Handler.c Add 'T' multiplier 2025-11-22 13:52:29 +01:00
NOP-Handler.readme Removed ppc-warpup from Architecture :) 2025-11-23 00:59:06 +01:00
OS4Compatibility.h Add MorphOS AmigaOS4 and AROS-i386 versions 2025-11-12 00:51:05 +01:00
README.md Add readme files 2025-11-22 15:34:32 +01:00
Startup.c Add MorphOS AmigaOS4 and AROS-i386 versions 2025-11-12 00:51:05 +01:00
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StartupOS4.c Add MorphOS AmigaOS4 and AROS-i386 versions 2025-11-12 00:51:05 +01:00

README.md

NOP-Handler

A handler which serves reads and writes instantly, without touching the data. Additionally, the size can be specified. This is useful for performance testing, as it can be used to remove the overhead of the underlaying I/O solution.

Installation

  • Copy the correct NOP-Handler file for your system to L:NOP-Handler.
  • Copy the NOP DOSDriver definition to SYS:Storage/DOSDrivers/ for manual mount or DEVS:DOSDrivers/ if you want it to automount.

Usage

Specify no name to get an unlimited stream, or a number of Bytes followed by an optional multiplier to get a stream limited to that size. The following multipliers are supported:

K = 2^10 = 1024
M = 2^20 = 1048576
G = 2^30 = 1073741824
T = 2^40 = 1099511627776

Examples

Copy from various sizes to drive

> copy NOP:1 Work:testfile-1
> copy NOP:123 Work:testfile-123
> copy NOP:1K Work:testfile-1K
> copy NOP:1M Work:testfile-1M
> copy NOP:1G Work:testfile-1G
> list NOHEAD NODATES Work:testfile#?
testfile-123                    123 ----rwed
testfile-1                        1 ----rwed
testfile-1K                    1024 ----rwed
testfile-1G              1073741824 ----rwed
testfile-1M                 1048576 ----rwed

Attempt to fill RAM: by copying from unlimited size

> copy NOP: RAM:testfile
Error in writing - disk is full
Destination file "RAM:testfile" removed.

Comparing difference between I/O plus computation and just computation, on same computer, running different OSs

A4000 CSPPC 68060@50MHz, 604e@200MHz, CSPPC SCSI, AmigaOS 3.9 + WarpOS 16.1

> UHC:C/time asum Work:test100M.bin
2f282b84e7e608d5852449ed940bfc51  Work:test100M.bin
9.077366s
> UHC:C/time asum NOP:100M
2354e80cdd59e14be436e528284206fe  NOP:100M
5.517848s

A4000 CSPPC 68060@50MHz, 604e@200MHz, CSPPC SCSI, MorphOS 1.4

> UHC:C/time asum Work:test100M.bin
2f282b84e7e608d5852449ed940bfc51  Work:test100M.bin
9.358638s
> UHC:C/time asum NOP:100M
9b0dc2b68a2a9938a09bf19d588b2960  NOP:100M
4.998199s

A4000 CSPPC 68060@50MHz, 604e@200MHz, CSPPC SCSI, AmigaOS 4.1 FE Update 3

> UHC:C/time asum Work:test100M.bin
2f282b84e7e608d5852449ed940bfc51  Work:test100M.bin
10.452084s
> UHC:C/time asum NOP:100M
5b6369aeb2cffd6a641e2f9af2bd894e  NOP:100M
4.983489s