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Apr
7
comment Capacity management - what metrics/KPI for CPU and RAM?
Ram and cache are load-dependant queuing centres, which are odd. They have a small and near-fixed cost until you run out of memory, at which time they suddenly turn into the disk queue of the swap device. Teamquest Model does memory if you ask, but they admit it pretty hard. I suspect they do a load-dependant queuing centre that reads data from the swap-disk queuing centre. I can do that by eye from vmstat and Solaris iostat, but I there isn't a good tool for it that I know about.
Apr
5
answered Capacity management - what metrics/KPI for CPU and RAM?
Feb
20
comment How can I estimate the request/second my server is capable of?
There should be: he's asked an absolutely standard question, answered below.
Feb
20
comment How can I estimate the request/second my server is capable of?
This is an absolutely standard question in queuing theory and/or capacity planning, and Mr Aliulis' answer is a perfectly fine first approximation. For an exact answer, try something like pdq. $ /gtest -s 0.2 -t 0.8 -q 4 1 100 10 # Closed solution from PDQ, where service time = 0.2, # think time = 0.8, dmax = 0, queues = 4 # Load, Response 1, 0.200000 11, 0.344304 21, 0.624339 31, 1.027152 41, 1.485103 51, 1.963362 61, 2.450325 71, 2.941689 81, 3.435564 91, 3.931000 If you plot this, it gives you the usual hocky-stick curve
Jan
10
awarded  Necromancer
Oct
3
answered What percentage of its capacity should I aim to run a network at?
Sep
24
awarded  Autobiographer
May
6
answered Calculating required uplink capacity of network switch
Mar
4
comment How many IOPS do I need? My workload bottleneck is storage
Transactions are what the user sees, IOPs are the disk IOs required to do the work. For example a bank transaction is debit followed by a credit, with each requiring a read to get the two accounts, followed by a write of the updates to both accounts. In that case, 1 TP takes 4 IOPs. 1 Transaction per second (TPS) will therefor require 4 IO Operations per second (IOPS), and so on.
Feb
28
answered How many IOPS do I need? My workload bottleneck is storage
Jul
17
awarded  Supporter
Jul
17
answered Performance issue on solaris 10 zone. Multiple pollsyscalls
Jul
17
answered Maximum throughput on switch with different link speeds
Jun
23
answered Dramatic disk I/O performance difference for two disks on same machine
May
24
answered ASP.net site on IIS7 - intermittently very slow on all remote connections, but always very fast locally
May
14
answered High await in sar
May
13
answered High await in sar
Apr
20
awarded  Editor
Apr
20
revised How do you do load testing and capacity planning for web sites?
Try to format...
Apr
20
answered How do you do load testing and capacity planning for web sites?