Hi Julien, dd if=/dev/urandom bs=1024k count=128 | base64 > BIGFILE.txt
ls -al BIGFILE.txt -rw-r--r-- 1 user user 181311669 Oct 16 06:24 BIGFILE.txt # From direct SSH connection, sans Guacamole time cat BIGFILE.txt 0.008u 2.280s 2:18.43 1.6% 0+0k 0+0io 0pf+0w # From Guacamole SSH connection time cat BIGFILE.txt 0.006u 2.150s 4:39.53 0.7%0+0k 0+0io 0pf+0w While it takes the roughly same about of elapsed/CPU time, it takes double the amount of user time. But in both cases, I can Ctrl-C. Given my ratio is 1:2 for direct:guacamole user time, and yours is 1:24, it could be Ctrl-C is not received adequately, given bandwidth. This is not really an answer, and your question only raises more questions. The first being, what version of libssh2 are you using, or what version of Docker image? Beyond that, I'll have to defer to the folks on the list. Fascinating... Luke > On 10/16/2023 8:04 AM CDT Luke H <[email protected]> wrote: > > > Even more fascinating. The reason I say so is that Apache Guacamole is one of > the most useful tools in a person's toolkit. > > While I have an idea why, let me see if I can replicate your issue. > > To be clear, if you connect directly via SSH without Guacamole, the cat takes > 4s. When using Guacamole with a defined SSH connection, it takes 1 minute 37 > seconds. > > People on this list can probably provide a quicker-to-the-point answer, but > it's my guess that the SSH (libssh2) library is mandating synchronous I/O to > the terminal (and therefore is limited to the bandwidth available to you), > where VNC/RDP can somewhat gloss over the terminal I/O. > > Put another way, SSH is more granular, thus requiring more time, based on > bandwidth. > > I'd love to know how many miles differentiate your computer and the VM, and > what type of Internet connection you have on your computer...hotspot, wired, > wifi, etc. > > It's my guess the answer lies somewhere in there. > > Luke > > > On 10/16/2023 6:34 AM CDT Julien Lejeune <[email protected]> wrote: > > > > > > Hi Luke, > > > > This is an SSH connection. > > > > > > Julien Lejeune > > IT administrator > > > > +32(0) 81 33 11 11 > > www.actia.be > > > > > > > > > > > > > > > > This email message as well as all attachments are for the sole use of the > > intended recipient(s) and may contain confidential and privileged > > information. > > Any unauthorized review, use, disclosure or distribution is prohibited. > > If you are not the intended recipient, please contact the sender by reply > > e-mail and destroy all copies of the original message. Thank you. > > > > -----Message d'origine----- > > De : [email protected] <[email protected]> > > Envoyé : lundi 16 octobre 2023 13:10 > > À : [email protected]; Julien Lejeune <[email protected]> > > Objet : Re: Slow output - Linux connections > > > > [Vous ne recevez pas souvent de courriers de > > [email protected]. Découvrez pourquoi ceci est important à > > https://aka.ms/LearnAboutSenderIdentification ] > > > > Hi Julien, this is a very interesting problem indeed, since you can confirm > > your VM has better timing sans Guacamole. > > > > A question: what type of connection to your VM is Guacamole using - VNC, > > RDP, SSH? > > > > Luke > > > > > On 10/16/2023 4:23 AM CDT Julien Lejeune <[email protected]> wrote: > > > > > > > > > Hi all ! > > > > > > I am currently experiencing a problem with my Guacamole instance. > > > When a user tries to show the content of a file within Guacamole with > > > something like « cat », the output takes a long time to come, and it is > > > not possible to interrupt the command with a CTRL + C for example. > > > I have done a comparison by using cat on a big log file within Guacamole > > > or directly connected through the Windows command line. > > > The command takes 1 minute and 37 seconds to execute with the Guacamole > > > session, but it only takes 4 seconds with the direct connection. > > > > > > I have monitored the Guacamole server's CPU and RAM. I see that the CPU > > > load average rises a little during the command execution (from 0.20 > > > before the test to 0.70 during the test on a 4CPU VM), but it doesn't > > > seem that bad to me. > > > > > > Has someone seen the same behavior? > > > If anybody has an idea of what could be the root cause, that would be > > > great. > > > > > > I'll send an update if I find what's causing the problem, in case it > > > helps someone. > > > > > > Best regards, > > > > > > [ACTIA]<http://www.actia.be/> > > > Julien Lejeune > > > IT administrator > > > > > > +32(0) 81 33 11 11 > > > > > > Contact me on > > > Teams<https://teams.microsoft.com/l/chat/0/[email protected]> > > > [cid:[email protected]] > > > > > > www.actia.be<http://www.actia.be/> [Linkedin] > > > <https://www.linkedin.com/company/actia-telematics-services> > > > Chaussée de Marche, 774 > > > B-5100 Naninne - BELGIUM > > > > > > > > > This email message as well as all attachments are for the sole use of the > > > intended recipient(s) and may contain confidential and privileged > > > information. > > > Any unauthorized review, use, disclosure or distribution is prohibited. > > > If you are not the intended recipient, please contact the sender by reply > > > e-mail and destroy all copies of the original message. Thank you. > > > > --------------------------------------------------------------------- > > To unsubscribe, e-mail: [email protected] > > For additional commands, e-mail: [email protected] > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [email protected] > For additional commands, e-mail: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
