I’m sure someone has asked something along these lines, but no matter how I word it, I can’t seem to find a definitive answer
Does RAM get some kind of indication as to how much data the CPU requires or is there a set amount of data and if the CPU needs more, it needs to call again (and what is that set amount of data).
During a cache miss, the CPU will require at least a single cache line (32, 64 or 128 bytes). Does the CPU need to query RAM multiple times to get a single cache line (assuming the set amount is 8 bytes) or does the RAM return more data per call or does RAM have some way of being notified as to how much data is required?
I’m aware the CPU is most likely going to call more than just a single cache line to avoid the lengthy request from RAM if more data is needed in future from the same block of memory.
If you do know and have more information, the following extras would also interest me:
- If this is different depending on CPU make (generational differences can also be interesting but if you do add information about that, please skip similar generations)
- If this is different depending on RAM type
- How the CPU can request a different sized cache line or block size (only applies if RAM returns a fixed size that’s the size of a block or cache line)
- Any other useful relevant information or resources for further reading
I was looking in my google analytics and discovered a few php hits to pages that, as a rails site obviously not apart of it. Here’s an example:
There’s quite of few of them. Are these hijack attempts or attacks. If so how do I stop them?
slack webapp have been acting very weird lately.
When I first log into slack, it shows everything correctly, like coloring the unread channels in bold white and providing the correct unread count.
On refresh, slacks stops showing the unread channels in bold white. I can still see them in the All Unreads though, which still makes this tool usable.
But, when I click on any starred channel and then back to All Unreads, I see that all is read, though it isn’t!!!
Again, refresh shows the correct number of unreads but doesn’t show the unread channels.
I tried signing out and in. Tried clearing the cookies.
I’m using a fresh install on Ubuntu 18.04 on chrome v 75.0.3770.100. Same issue on firefox as well.
i tried ctrl alt + f1 , ctrl + alt + f2 , no response, and have to use the reset button to reset the system here are some syslogs , i can’t understand, i didnt reboot immediately but after the freeze, cpu usage at around 12% and free memory at around 69%, no indication, happened 3 times in one day.
May 21 10:38:07 xps-ubuntu dbus-daemon: [system] Activating via systemd: service name='org.freedesktop.nm_dispatcher' unit='dbus-org.freedesktop.nm-dispatcher.service' requested by ':1.11' (uid=0 pid=1062 comm="/usr/sbin/NetworkManager --no-daemon " label="unconfined") May 21 10:38:07 xps-ubuntu systemd: Starting Network Manager Script Dispatcher Service... May 21 10:38:07 xps-ubuntu dbus-daemon: [system] Successfully activated service 'org.freedesktop.nm_dispatcher' May 21 10:38:07 xps-ubuntu systemd: Started Network Manager Script Dispatcher Service. May 21 10:38:07 xps-ubuntu nm-dispatcher: req:1 'connectivity-change': new request (1 scripts) May 21 10:38:07 xps-ubuntu nm-dispatcher: req:1 'connectivity-change': start running ordered scripts... May 21 10:38:08 xps-ubuntu whoopsie: [10:38:08] offline May 21 10:40:20 xps-ubuntu gnome-shell: Some code accessed the property 'WindowPreviewMenuItem' on the module 'windowPreview'. That property was defined with 'let' or 'const' inside the module. This was previously supported, but is not correct according to the ES6 standard. Any symbols to be exported from a module must be defined with 'var'. The property access will work as previously for the time being, but please fix your code anyway. May 21 10:52:21 xps-ubuntu systemd-modules-load: Inserted module 'lp' May 21 10:52:21 xps-ubuntu systemd-modules-load: Inserted module 'ppdev' May 21 10:52:21 xps-ubuntu systemd-modules-load: Inserted module 'parport_pc' May 21 10:52:21 xps-ubuntu systemd-modules-load: Inserted module 'coretemp' May 21 10:52:21 xps-ubuntu systemd: Starting Flush Journal to Persistent Storage...
May 21 10:26:30 xps-ubuntu kernel: [ 237.968095] dell_wmi: Unknown key with type 0x0010 and code 0x0041 pressed May 21 10:26:31 xps-ubuntu kernel: [ 238.998171] dell_wmi: Unknown key with type 0x0010 and code 0x0041 pressed May 21 10:52:21 xps-ubuntu kernel: [ 0.000000] microcode: microcode updated early to revision 0xb4, date = 2019-04-01 May 21 10:52:21 xps-ubuntu kernel: [ 0.000000] Linux version 4.18.0-20-generic (buildd@lcy01-amd64-020) (gcc version 7.3.0 (Ubuntu 7.3.0-16ubuntu3)) #21~18.04.1-Ubuntu SMP Wed May 8 08:43:37 UTC 2019 (Ubuntu 4.18.0-20.21~18.04.1-generic 4.18.20) May 21 10:52:21 xps-ubuntu kernel: [ 0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-4.18.0-20-generic root=UUID=0286d0a5-46b7-455f-a5ce-8d6e5ed2aa6d ro quiet splash vt.handoff=1 May 21 10:52:21 xps-ubuntu kernel: [ 0.000000] KERNEL supported cpus: May 21 10:52:21 xps-ubuntu kernel: [ 0.000000] Intel GenuineIntel
i’m using dell xps 13 9370 with windows pre-installed and dual-boot with ubuntu, i’m also using a usb-c to USB hub and connected to a bluetooth mouse, at the time when the screen freezes, it also connected with an iphone
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