[sane-devel] Scanner Button Daemon [scanbd]: high CPU utilization

[Simon Matter]

> Hi David,
>
> Am 24.11.2011 21:49, schrieb Rastislav David:
>> Hello all,
>>
>> I've succesfully compiled scanbd for my Canon CanoScan LiDE 110 on my
>> ARM powered NAS Linksys DNS-323 running Debian Wheezy.
>>
>> It works :) however there are few issues.
>> 1) scanbd is using 100% of CPU load and thus misses some button presses

Hi,

I remember that running my own scanmonitor (which also does button
handling) I observed strange behavior when running against my cheap
plustek backed Epson scanner. The issue was also high CPU load and I never
found out why, what I know is that other scanners like the Fujitsu fi-6x
series never had such problems.

Maybe this is related here with scanbd and the genesys backend?

Regards,
Simon

>
> looks like a config problem: please post your scanbd.conf
>
>> 2) does not react on Pdf button (nothing logged into console when
>> pressed) There are 4 buttons. [Pdf Auto-Scan Copy Email]
>
> we must check the log-file to find out the name of the pdf-button
>
>>
>> If I start daemon with: ./scanbd -df -c scanbd.conf
>>
>> I see:
>>
>> ./scanbd: debug on: level: 7
>> ./scanbd: dropping privs to uid saned
>> ./scanbd: dropping privs to uid scanner
>> ./scanbd: group scanner has member:
>> ./scanbd: saned
>> ./scanbd: drop privileges to gid: 104
>> ./scanbd: Running as effective gid 104
>> ./scanbd: drop privileges to uid: 110
>> ./scanbd: Running as effective uid 110
>> ./scanbd: dbus_init
>> ./scanbd: dbus match
>> type='signal',interface='org.freedesktop.Hal.Manager'
>> ./scanbd: sane version 1.0
>> ./scanbd: Scanning for local-only devices
>> ./scanbd: found device: genesys:libusb:001:011 Canon LiDE 110 flatbed
>> scanner
>> ./scanbd: start_sane_threads
>> ./scanbd: Starting poll thread for genesys:libusb:001:011
>> ./scanbd: Thread started for device genesys:libusb:001:011
>> ./scanbd: sane_poll
>> ./scanbd: start udev thread
>> ./scanbd: timeout: 400 ms
>> ./scanbd: udev thread started
>> ./scanbd: Iteration on dbus call
>> ./scanbd: no device from udev
>> ./scanbd: no device from udev
>> ....
>> 300x / second
>> ./scanbd: no device from udev
>> ./scanbd: no device from udev
>> ./scanbd: no device from udev
>> ./scanbd: no device from udev
>> ./scanbd: no device from udev
>> ./scanbd: found 41 options for device genesys:libusb:001:011
>> ./scanbd: sane_find_matching_options
>> ./scanbd: found 5 actions in section (null)
>> ./scanbd: checking action scan with filter: ^scan.*
>> ./scanbd: found active option[2] mode (type: 3) for device
>> genesys:libusb:001:01
>> 1
>> ./scanbd: found active option[4] preview (type: 0) for device
>> genesys:libusb:001
>> :011
>> ./scanbd: found active option[5] depth (type: 1) for device
>> genesys:libusb:001:0
>> 11
>> ./scanbd: found active option[6] resolution (type: 1) for device
>> genesys:libusb:
>> 001:011
>> ./scanbd: found active option[8] tl-x (type: 2) for device
>> genesys:libusb:001:01
>> 1
>> ./scanbd: found active option[9] tl-y (type: 2) for device
>> genesys:libusb:001:01
>> 1
>> ./scanbd: found active option[10] br-x (type: 2) for device
>> genesys:libusb:001:011
>> ./scanbd: found active option[11] br-y (type: 2) for device
>> genesys:libusb:001:011
>>
>>
>> these "no device from udev" messages are generated about 300/s which I
>> think is causing high CPU utilization.
>
> That's strange: did not see this before :-(
>
>>
>> in scandb.conf I left all devices as they were and for actions scan
>> email and copy I've changed script to /etc/scanbd/action.script.
>> This script works fine for said 3 buttons.
>>
>> Can You help where could be the issue with High CPU utilization?
>> Is there some problem with configuration?
>
> I think this has to to with the libudev. You can disable libudev at
> compile-time (and using hald if you want) loosing the capability to
> dynamically add scanners. Can you give this a try, please?
>
>>
>> Rastislav
>>
>> P.S: for scanbd to compile I had to change
>> -I/usr/local/include/dbus-1.0/include to
>> -I/usr/lib/arm-linux-gnueabi/dbus-1.0/include
>>
>>
>>
>
>
> --
> Wilhelm
>
>
> --
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