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I have 10 ES Servers each one with 32Cores Cpu, 256G memory and 10Gb NIC. The ES cluster will face about 9000 times request(index or query) per second. Do you think this would be a problem, or any optimization I should do please.
It depends on the index structure, data amount and the queries you're doing. Hardware alone does not guarantee anything. I have seen clusters two times less powerful than yours which were capable to handle 10k/sec. However I can easily imagine queries and aggregations that will take some time to run on your cluster.
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The Computer is designed to execute certain tasks exactly.
It is not able to make arbitrary tasks : So how can It generate random numbers?
Yes, you are right. Computers cannot generate Purely Random numbers. Therefore, they are called Pseudo Random. Most common technique used, today, to generate a random number is by reading the machine time in milliseconds and perform arithmetic operations on it to get a new number every time. You can read more about it here
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I see the following ps output. What does U<s mean? How to force it running?
root 3531 0.0 0.4 4737660 34172 ?? U<s Wed09AM 189:36.15 /System/Library/CoreServices/backupd.bundle/Contents/Resources/backupd
U is uninterruptible wait
< is high priority
s is session leader
The last 2 are in common with other systems; I've never seen U before (uninterruptible wait is usually 'D' since disk I/O is a common case).
It can't be "forced" to run except by completion of whatever it's waiting for, which is not apparent from just the state.
How do you know it's not running? I imagine that a backup process is I/O bound so it will quite likely be in an I/O wait when you look at it - but that doesn't mean it's been waiting all alone; it could be flipping between waiting and running quite rapidly.
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Here is what I see in MacOS Activity Monitor, note %CPU column.
First item (Xcode process) shows 122.4 value. Any idea what it represents? If it is 122.4% then percent of what exactly?
The %Cpu usually represents the % usage of a single core on your processor. If you have a quad-core, you have a total usage possibility of 400%.
Your first process in your list has 28 threads spread accross more than one core which are using more execution than a full single core.
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my computer has ubuntu 14 installed. There are a total of 40 CPUs, and 260G memory.
I use top command line to check the status of the processes. I was expecting that for each individual process, the virt value should be approximately equal to 260 * mem%. However, it is not.
Could you anyone help me to figure out why?
Thanks for any input:))
The MEM% column shows the amount of physical memory that is being used by a process. This amount is called the "Resident Set Size" (RSS) and is given in the RES column. The amount of virtual memory on a system is effectively unlimited due to the fact that each process has their own LDT (on x86; other architectures' MMUs have their own equivalents).
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I am trying to get bandwidth value of Wan interface in Open-Wrt router (WRT54GL) using
OID: 1.3.6.1.2.1.2.2.1.10.4
But I keep getting value around 4174517174
I was doing some calculations and it does not make any sense:
4174517174 / 8 / 1024 /1024 = 497 MB/s
Does this value contains more info like time or something or my OID is incorrect ?
I have got the answer. Its the whole traffic which has passed trow this interface. To get the bandwidth you need to get the difference between two past values...