I have a B+ tree index containing 10M leaves. I know that a block size in the memory is 4KB, and that RAM is also 4KB.
How can I calculate what is the maximum and minimum memory usage?
also, how can I tell what is the actual storage space allocated to the index?
thanks
Related
Consider a file system that uses contiguous allocation method. For a disk
consists of 100 data blocks, each block is 4KB. What is the maximum and
minimum number of files of size 15KB can it save? Find the number of files the
disk able to support using (1) link allocation and (2) index allocation, assuming
the address is 32 bit
I am just curious about the array size of any programming language prefereably which can allow high size. after reading this link
What is the Maximum Size that an Array can hold?
is it that the Maximum array size is equivalent to RAM theoretically?, as RAM has to work on other application etc also. Or can we increase the virtual memory to accommodate any size of array.
Depend on ram size, and ram is constantly consumed and released back.so u can not figure how much for sure u can utilize. If theratically speak. If only array and ram then yes keeping every thing e.g os and programs out of question.
Say, for instance, I have 16GB of memory and am doing a very large amount of dynamic memory allocation in C (just for testing, nothing in particular). How can I determine how large the heap will be able to grow to, to accommodate my calloc's?
I want to enable live indexing on my cluster. As per the steps here, I must increase the heap size to at least 20 GB. I have 3 nodes in my cluster, each having 32 GB of RAM. The current heap size configuration is shown below
Is it recommendable for me to change my heap size to 20GB with the same amount of RAM? If not, what should the recommended heap size be for my RAM so that live indexing works correctly?
Search query performance depends on our ability to utilize the OS page cache effectively to keep search indexes hot. The smaller the size of your indexes, the easier it will be for the OS to maintain them in memory.
If you increase your heap, that's less RAM available for page cache and less likelihood that you'll be fitting those indexes in RAM. Check their size in the solr.data directory and see if you have enough RAM.
Also check out my post on decreasing index size:
http://www.sestevez.com/solr-space-saving-profile/
How can I increase the mesh size of Comsol without increasing the memory of my system?
My system memory is 32 GB but I cannot simulate my problem because it needs a lot of memory.
How can I solve this problem?
Increase the mesh size. Increasing the mesh size cause decreasing the amount of memory that is needed for simulation. With increasing the mesh size you can solve huge problems with less memory. There is no other way for decreasing the amount of memory that you need for simulation; because you don't write any program and all things done automatically in COMSOL.