wangxiao1254 / flexsc Goto Github PK

I guess it is only for me... I tried to debug why output is not available, and finally, finally, found that result for runXXX.sh test example is not out if use CIRCUIT mode - there will be Null Pointer Exception.

So I guess to use OPT as the default mode in "FlexSC/Config.conf".

Or is there anything wrong with my environtment?

@kartik1507

In FlexSC/test/oram/TestCircuitOramRec.java, after each write,

Flag.sw.startTotal();
client.write(client.baseOram.lib.toSignals(element), scData);
double t = Flag.sw.stopTotal();
Flag.sw.addCounter();

We increase the counter.

In FlexSC/src/util/StopWatch.java, the default value of the counter is:

long counter = 1;

flush() also makes it back to 1.

However, to print the result:

System.out.println(elapsedTimeTotal / 1000000000.0 / counter + "\t"

So, if we do experiments for 128 writes, the result is the total divided by 129.

I am doing experiments for 10 writes (for very big input), the result is divided by 11 (kind of problematic).

It seems that Flag StopWatch with a counter is only used to measure the Circuit ORAM.
So I think I can submit a PR to reduce 1 counter increasement.

This also affects the ObliVMGC library because the code is the same. (maybe no need to fix that one)
https://github.com/oblivm/ObliVMGC/tree/master/java/com/oblivm/backend

src/util/Reciever.java

-> Receiver

Guesses we need to change many files...