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Questions tagged [performance]

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The speed at which a program runs

1,062 questions
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I have a usb 3.0 apricorn usb disk, 1tb size I think, for which this has been done to it under RHEL-8.10 and is only used on servers running RHEL-8.10 : parted /dev/sdb mklabel gpt mkpart primary 0% ...
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2 votes
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If you would open a listening socket on every possible TCP/UDP port (so thousands in total), without actually using them, what would be the cost in terms of performance? Is it merely an administrative ...
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1 answer
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I asked the question yesterday of why is NFSv4 so much slower than scp. I narrowed down things a bit, my real question now is why is rsync slow compared to cp ? as I don't think NFS is a factor. I've ...
ron's user avatar
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1 vote
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why is NFSv4 so much slower than scp? mellanox 100gbps switch no load on two servers, just me, no load on the switch RHEL-8.10 x64-64 scp *tar 192.168.2.1:/data/ a.tar ...
ron's user avatar
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2 votes
2 answers
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In my current setup, I have three different filesystems on two different SSDs: A FAT partition and a BTRFS partition on one drive, and ext4 on a second drive. When running fstrim, the output is ...
Hari's user avatar
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9 votes
1 answer
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I recently upgraded the NVME drives on my workstation machine, from a pair of Samsung EVO 970 512GB drives to a pair of of Kingston Fury 2TB drives. All went well, and I even converted the machine ...
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2 votes
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I don't know what to do I spend around 2 weeks setting up XRDP. I have XRDP up and running with Xorg on a 64 core epyc 3 gen. and performance is terrible. The machine's main usage should be as a ...
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Hello I use XRDP for multiuser and I have performance issue and connec issue. First, is about channel drdynvc if its set to TRUE I cannot connect from windows RDP client and can connect without issues ...
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1 vote
2 answers
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I have Oracle VM on my Windows 10 laptop and installed Kali Linux on it. But after using the VM several times, Kali Linux crashes and does not launch. So, I decided to install Kali Linux on an ...
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I am trying to determine the libraries needed for pg_restore in the official postgres:15 docker image, but when I run ldd /usr/bin/pg_restore inside the container it returns this error: not a dynamic ...
Ricardo Silva's user avatar
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2 votes
0 answers
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I have a ZFS pool comprising a mirror comprising two partitions encypted with dm-crypt. $ zpool list -v data2 NAME SIZE ALLOC FREE CKPOINT EXPANDSZ FRAG CAP DEDUP ...
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I am running the command dd bs=1M if=/dev/zero of=/dev/md7 status=progress. It started very slow at 4 MB/s but now has dropped to 1 MB/s. This is a standard SATA disk that was running perfectly ...
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I have a pair of NVMe Crucial P5 Plus partitioned with an mdadm RAID1 partition formatted as XFS for / and another ZFS RAIDZ1 partition for the remainder of the disk. Performance of the XFS partition ...
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I asked a similar question here : NFS v4.2 tuning with less than 50 servers on a closed infiniband [mellanox] HDR network switch all running RHEL-8.10: is there anything other than systemctl start ...
ron's user avatar
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2 votes
2 answers
104 views

I used gzip to compress an image which is quite huge still. dd if=/dev/sda2 bs=1M | gzip -c -9 > sda2.dd.img.gz then I changed the partitioning of the Drive because I wanted to install Linux. And ...
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