My gmp experience with AWS; Searching; libgmp.a

[EvaOrLew Baxter]

  1.  I tried both C4 and C5a Instance Types and did a simple benchmark of one calculation which is representative of my application: x^y mod z with 30000 digits. C4 took 131 seconds and costs $0.398/hour, so 1 calculation costs 1.45 cents. C5a takes 88 sec with cost of $0.308/hour, so 1 calculation costs 0.93 cents.  So, C5a is about 36% faster than C4. (I installed gmp using: 'sudo apt install libgmp3-dev'.)
  2.   Is there a simple way to search gmp-disuss for a topic, or do I have to download each archive and do my own text search?
  3.  Can the gmp program determine (eg by a flag, or gmp constant) what version of libgmp.a is being used: the architecture specific one, or the generic one?

Lewis