Hello everyone.
I noticed that my IBM CPLEX license is beeing checked too frequently (and also it takes about 3 seconds for me): sometimes after 5 seconds, sometimes after 15 seconds. So probably for some reason validation of my key is not cached as it should? Can anyone please suggest what can I do about it? At this point CPLEX spends much more time checking license than doing actual problem solving.

Thank you.

Hello 

We don't observe any latency on the server side . 

Could you verify you use the correct variable CPLEX_STUDIO_KEY_SERVER ? (https://www.ibm.com/support/pages/entering-your-api-key-and-setting-cplexstudio-environment-variables)

You can evaluate  your key using the  the following command (using your API key ) : 

curl -X POST 'https://cos-api.mybluemix.net/cos/query/v1/apikeys?apikey=XXXXXX'

cf https://www.ibm.com/support/pages/node/6954451

Regards

Hello Christophe. Thank you for the reply.

Yes, I use the correct variable for key server.
I am not sure whats going on, but `curl` call takes about 800 msec which is OK, I guess.
Also, I noticed that the time needed for license check increases with each check starting from around 2.5 seconds and increasing up to 3 seconds in almost non-decreasing fashion. I have no idea whats going on here.

But anyway, I solved this issue simply by calling `CTXopenCPLEX` just once instead of doing it repeatedly for each problem that I solve. So instead of calling CTXopenCPLEX *and* CTXcreatProb many times, I call CTXopnCPLEX once and then CTXcreatProb many times.

Again, thank you for your reply/ I will now close this thread.