Hot answers tagged scalability
To address your questions: How many lines may crontab have? I'm not aware of any maximum number of lines in crontab. However, more than a few hundred lines is probably fairly uncommon (hence not well-tested), and also hard to maintain. So I'd probably avoid exceeding that. Does it fork for each scheduled job? Yes. That said, cron is not really ...
I suspect the Scalability: "1S" means it only supports single socket setups. So you cannot create a system with two sockets and fill only one until you need your system to scale up to handle more load and then to accomplish that, simply add a second processor. You can do that with Xeon processors though, for example E5-2440 v2 has "2S Only".
Here are answers for one cron daemon, dillon's cron (dcron) which I'm the current developer of. There are a variety of cron daemons in distribution, and the answers are going to be different. Vixie cron is probably the most widespread; I don't know the answers for that. Anyway, for dillon's cron, a user can have 256 significant lines in their crontab (this ...
Yes, it will fork for every cronjob. But if your server is even moderately powerful, I think you will not encounter any problems very soon. My personal home pages are running on a very old Pentium III 1.1 GHz / 512 MB RAM / slow IDE HD, and it does not suffer from running around 15 different cronjobs every hour. If your cronjobs are extremely cpu or I/O ...
In general, ecomomies of scale mean a single high res camera, will affect your system less than 4 smaller cameras of quarter of the resolution. The easiest way to measure performance is to look in task manager with one or two cameras connected, and look at the CPU loading for that camera. Ensure it doesn't exceed a few percent or otherwise you could start ...
if i want to manage it , use DFS to fix the FQDN of my file address that want to link together set versioning of my SharePoint library on update my softwares and server copy with the synchronize softwares or backup solutions create a map network drive on static letter Drive with GPO with Active directory Group Policy
Freemind has a user who has successfully gone up to 22,000 nodes (with some slowdown, but still useable) on a rather old computer with 2GB of RAM.
The maximum supported VMDK size on an VMFS-5 datastore is increased to 62 TB. However, the maximum supported VMDK size on VMFS-3 is still 2 TB. The maximum supported size of a VMDK on NFS is the lesser of 62 TB and 1% less than the maximum file size supported by the NFS filesystem. (straight from the first google search for that particular question.) ...
One thing that you should bear in mind is that while a QVGA needs very little bandwidth, many cheap webcams only run at 'full-speed' (12Mbit/s) even if they say they are "USB 2.0" devices (only USB 2.0 'Hi-speed' devices run at 480Mbit/s). Not only that, but if you plug multiple 'full-speed' devices into a standard single-TT USB hub (which is most of them) ...
I finally was able to find the tool I used many moons ago under Win9x: CadStd Lite!
I had a simular problem, having to manage a lot of processes in my crontab. What I did was write one main script, which listed all executable files and links in a certain folder (provided on the commandline) and executed them consecutively. This script I put in crontab with for example the "monitor" parameter, which would run every minute and execute all ...
If you would like to learn in detail then, "Parallel Computer Architecture: A Hardware/Software Approach" book is authoritative guide to this subject. Also you would find slides at this site quite useful. (Lec 8-10)
I would have a look through docs.sun.com for documentation for the UltraSPARC CPU as well as some of their bigger systems. They've been dealing with issues like this for a long, long time, and their documentation is usually excellent. Here's a good place to start: http://www.google.com/search?q=cache+coherence+site:docs.sun.com Full disclosure: I used to ...
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