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change default minimum chunk size to 16MB (Issue #20)

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Ryo Nakamura
2024-04-26 18:17:13 +09:00
parent 01fe30efc7
commit 7c5314ea11
4 changed files with 14 additions and 15 deletions
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2
doc/mscp.1.in
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@@ -192,7 +192,7 @@ and remove the checkpoint if it returns 0.
Specifies the minimum chunk size.
.B mscp
divides a single file into chunks and copies the chunks in
parallel. The default value is 67108864 (64MB).
parallel. The default value is 16M bytes.
.TP
.B \-S \fIMAX_CHUNK_SIZE\fR

23
doc/mscp.rst
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@@ -2,7 +2,7 @@
MSCP
====
:Date: v0.2.0
:Date: v0.2.0-5-g08660bb
NAME
====
@@ -12,15 +12,14 @@ mscp - copy files over multiple SSH connections
SYNOPSIS
========
**mscp** [**-46vqDpdNh**] [ **-n**\ *NR_CONNECTIONS* ] [
**-m**\ *COREMASK* ] [ **-u**\ *MAX_STARTUPS* ] [ **-I**\ *INTERVAL* ] [
**-W**\ *CHECKPOINT* ] [ **-R**\ *CHECKPOINT* ] [
**-s**\ *MIN_CHUNK_SIZE* ] [ **-S**\ *MAX_CHUNK_SIZE* ] [
**-a**\ *NR_AHEAD* ] [ **-b**\ *BUF_SIZE* ] [ **-L**\ *LIMIT_BITRATE* ]
[ **-l**\ *LOGIN_NAME* ] [ **-P**\ *PORT* ] [ **-F**\ *SSH_CONFIG* ] [
**-o**\ *SSH_OPTION* ] [ **-i**\ *IDENTITY* ] [ **-J**\ *DESTINATION* ]
[ **-c**\ *CIPHER* ] [ **-M**\ *HMAC* ] [ **-C**\ *COMPRESS* ] [
**-g**\ *CONGESTION* ] *source ... target*
**mscp** [**-46vqDpdNh**] [ **-n** *NR_CONNECTIONS* ] [ **-m**
*COREMASK* ] [ **-u** *MAX_STARTUPS* ] [ **-I** *INTERVAL* ] [ **-W**
*CHECKPOINT* ] [ **-R** *CHECKPOINT* ] [ **-s** *MIN_CHUNK_SIZE* ] [
**-S** *MAX_CHUNK_SIZE* ] [ **-a** *NR_AHEAD* ] [ **-b** *BUF_SIZE* ] [
**-L** *LIMIT_BITRATE* ] [ **-l** *LOGIN_NAME* ] [ **-P** *PORT* ] [
**-F** *SSH_CONFIG* ] [ **-o** *SSH_OPTION* ] [ **-i** *IDENTITY* ] [
**-J** *DESTINATION* ] [ **-c** *CIPHER* ] [ **-M** *HMAC* ] [ **-C**
*COMPRESS* ] [ **-g** *CONGESTION* ] *source ... target*
DESCRIPTION
===========
@@ -98,8 +97,8 @@ OPTIONS
**-s MIN_CHUNK_SIZE**
Specifies the minimum chunk size. **mscp** divides a single file into
chunks and copies the chunks in parallel. The default value is
67108864 (64MB).
chunks and copies the chunks in parallel. The default value is 16M
bytes.
**-S MAX_CHUNK_SIZE**
Specifies the maximum chunk size. The default is file size divided by

2
src/main.c
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@@ -46,7 +46,7 @@ void usage(bool print_help)
" -W CHECKPOINT write states to the checkpoint if transfer fails\n"
" -R CHECKPOINT resume transferring from the checkpoint\n"
"\n"
" -s MIN_CHUNK_SIZE min chunk size (default: 64MB)\n"
" -s MIN_CHUNK_SIZE min chunk size (default: 16M bytes)\n"
" -S MAX_CHUNK_SIZE max chunk size (default: filesize/nr_conn)\n"
" -a NR_AHEAD number of inflight SFTP commands (default: 32)\n"
" -b BUF_SZ buffer size for i/o and transfer\n"

2
src/mscp.c
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@@ -62,7 +62,7 @@ struct mscp {
struct mscp_thread scan; /* mscp_thread for mscp_scan_thread() */
};
#define DEFAULT_MIN_CHUNK_SZ (64 << 20) /* 64MB */
#define DEFAULT_MIN_CHUNK_SZ (16 << 20) /* 16MB */
#define DEFAULT_NR_AHEAD 32
#define DEFAULT_BUF_SZ 16384
/* XXX: we use 16384 byte buffer pointed by