Comparative timings for cp using two SDHC-USB adapters; was Re(3ish): USB adapter for SD card.
Timings for copying 1434 files from an SDHC card to a hdd and from the
hdd to the SDHC using two different adapters follow. A is the
mount point for the SDHC-USB adapter. Backup is a directory on the hdd.
File sizes range from 0 to 51.5 MiB.
AtoBackup is approximately 16 times faster using the second adapter
compared to the first. BackuptoA is more than three times faster using
the second adapter compared to the first. One USB socket was used
for all tests.
http://carnot.yi.org/SdhcUsbAdapters.html
Regards, ... Peter E.
=========================
$ grep Ato .bashrc
AtoBackup() { cp -vauf /home/peter/A/* /home/peter/Backup; }
$ grep toA .bashrc
BackuptoA() { cp -vauf /home/peter/Backup/* /home/peter/MY; }
$ # http://www.ebay.ca/itm/111153740723
$ # with 4 GB SDHC, mounted at A.
$ ls -1 A | wc -l
1434
$ du -s A
721056 A
$ Backup is a directory on the hdd.
$ rm Backup/*
$ time AtoBackup
[output omitted]
real 7m46.016s
user 0m0.196s
sys 0m2.824s
$ rm A/*
$ time BackuptoA
[output omitted]
real 8m53.698s
user 0m0.276s
sys 0m2.208s
$ ls -1 A | wc -l
1434
$ du -s A
721056 A
$ # http://www.ebay.ca/itm/231081576986
$ # with same 4 GB SDHC, mounted at A.
$ rm Backup/*
$ time AtoBackup
[output omitted]
real 0m24.459s
user 0m0.120s
sys 0m2.600s
$ ls -1 Backup | wc -l
1434
$ du -s Backup
407504 Backup
$ rm A/*
$ time BackuptoA
[output omitted]
real 2m24.244s
user 0m0.164s
sys 0m2.308s
$ ls -1 A | wc -l
1434
$ du -s A
721056 A
=========================
--
123456789 123456789 123456789 123456789 123456789 123456789 123456789 12
Tel +13606390202 Bcc: peasthope at shaw.ca http://carnot.yi.org/
Reply to: