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Performance issue!

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Top Forums UNIX for Advanced & Expert Users Performance issue!
# 8  
Old 03-23-2009
That's your CDROM. Try hdb or hdc. Your disk may also be SCSI, in which case hdparm won't do much.
# 9  
Old 03-24-2009
well it seems that my disk is sda2
Code:
$df- h
Filesystem            Size  Used Avail Use% Mounted on
/dev/sda2             225G  137G   78G  64% /
/dev/sda1              92M  9.4M   78M  11% /boot
none                 1004M     0 1004M   0% /dev/shm

Now if i am executing commands of hdparm, the out put are as below.
Code:
$hdparm -d /dev/sda2

/dev/sda2:

Code:
$hdparm -I /dev/sda2
ATA device, with non-removable media
        Model Number:       ST3250310AS
        Serial Number:      6RY1VV58
        Firmware Revision:  3.AAC
Standards:
        Supported: 7 6 5 4
        Likely used: 7
Configuration:
        Logical         max     current
        cylinders       16383   16383
        heads           16      16
        sectors/track   63      63
        --
        CHS current addressable sectors:   16514064
        LBA    user addressable sectors:  268435455
        LBA48  user addressable sectors:  488397168
        device size with M = 1024*1024:      238475 MBytes
        device size with M = 1000*1000:      250059 MBytes (250 GB)
Capabilities:
        LBA, IORDY(can be disabled)
        Queue depth: 32
        Standby timer values: spec'd by Standard, no device specific minimum
        R/W multiple sector transfer: Max = 16  Current = 16
        Recommended acoustic management value: 208, current value: 0
        DMA: mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3 udma4 udma5 *udma6
             Cycle time: min=120ns recommended=120ns
        PIO: pio0 pio1 pio2 pio3 pio4
             Cycle time: no flow control=120ns  IORDY flow control=120ns
Commands/features:
        Enabled Supported:
           *    READ BUFFER cmd
           *    WRITE BUFFER cmd
           *    Host Protected Area feature set
           *    Look-ahead
           *    Write cache
           *    Power Management feature set
                Security Mode feature set
           *    SMART feature set
           *    FLUSH CACHE EXT command
           *    Mandatory FLUSH CACHE command
           *    Device Configuration Overlay feature set
           *    48-bit Address feature set
                SET MAX security extension
           *    DOWNLOAD MICROCODE cmd
           *    General Purpose Logging feature set
           *    SMART self-test
           *    SMART error logging
Security:
        Master password revision code = 65534
                supported
        not     enabled
        not     locked
                frozen
        not     expired: security count
        not     supported: enhanced erase
Checksum: correct

Code:
$hdparm -tT /dev/sda2
/dev/sda2:
 Timing cached reads:   3032 MB in  2.00 seconds = 1514.72 MB/sec
 Timing buffered disk reads:  234 MB in  3.02 seconds =  77.47 MB/sec

From the first output it seems that DMA is not enabled. and when i tried to enable it using command below it fails.
Code:
$hdparm -d1 /dev/sda2
/dev/sda2:
 setting using_dma to 1 (on)
 HDIO_SET_DMA failed: Inappropriate ioctl for device

# 10  
Old 03-24-2009
As already explained hdparm is for IDE disks. You can't enable IDE DMA on a disk or driver that's not IDE. It does seem to be able to do benchmarks though, which shows your disk running at rather good speeds indeed.

What really ruins disk performance is random seeking. Every time the head moves the disk has to wait and do nothing until its ready. Could your program be made to process data sequentially instead of seeking all over the place in the file?

Another thing you could do is add more memory. More of the file will be able to stay in cache, which will increase performance a lot.
# 11  
Old 03-25-2009
By adding memory do you mean to add extra RAM disk(hardware) in the system?
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