== sanity test 255a: check 'lfs ladvise -a willread' ===== 23:41:14 (1769056874)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 17.2018 s, 6.1 MB/s
ladvise: range [2, 1] is invalid
Provide servers with advice about access patterns for a file.
usage: ladvise [--advice|-a ADVICE] [--start|-s START[kMGT]]
               [--background|-b] [--unset|-u]

               {--end|-e END[kMGT]|--length|-l LENGTH[kMGT]}
               {[--mode|-m [READ,WRITE]}
               <file> ...

ladvise: range [2, 2] is invalid
Provide servers with advice about access patterns for a file.
usage: ladvise [--advice|-a ADVICE] [--start|-s START[kMGT]]
               [--background|-b] [--unset|-u]

               {--end|-e END[kMGT]|--length|-l LENGTH[kMGT]}
               {[--mode|-m [READ,WRITE]}
               <file> ...

ladvise: conflicting arguments of -l and -e
Provide servers with advice about access patterns for a file.
usage: ladvise [--advice|-a ADVICE] [--start|-s START[kMGT]]
               [--background|-b] [--unset|-u]

               {--end|-e END[kMGT]|--length|-l LENGTH[kMGT]}
               {[--mode|-m [READ,WRITE]}
               <file> ...

Synchronous ladvise should wait
fail_val=8
fail_loc=0x237
Asynchronous ladvise shouldn't wait
llite.lustre-ffff8e6305c20000.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.325449
Iter 1/10: OSS cache speed: 0.330847
Iter 1/10: ladvise speed: 0.380744
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.382577
Iter 2/10: OSS cache speed: 0.519558
Iter 2/10: ladvise speed: 0.501695
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.471092
Iter 3/10: OSS cache speed: 0.485669
Iter 3/10: ladvise speed: 0.434368
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.287105
Iter 4/10: OSS cache speed: 0.345226
Iter 4/10: ladvise speed: 0.389794
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.350848
Iter 5/10: OSS cache speed: 0.301084
Iter 5/10: ladvise speed: 0.306229
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.308628
Iter 6/10: OSS cache speed: 0.295513
Iter 6/10: ladvise speed: 0.289462
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.271716
Iter 7/10: OSS cache speed: 0.275155
Iter 7/10: ladvise speed: 0.299035
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.310147
Iter 8/10: OSS cache speed: 0.338092
Iter 8/10: ladvise speed: 0.400618
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.352259
Iter 9/10: OSS cache speed: 0.397316
Iter 9/10: ladvise speed: 0.438494
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.452974
Iter 10/10: OSS cache speed: 0.493998
Iter 10/10: ladvise speed: 0.478454
Average uncached read: .35
Average speedup with OSS cached read:  .37 = +5%
Average speedup with ladvise willread:  .39 = +11%
Speedup with OSS cached read less than 20%,  got 5%. Skipping ladvise willread check.
fail_loc=0