== sanity test 255a: check 'lfs ladvise -a willread' ===== 19:59:51 (1788652791)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 12.0922 s, 8.7 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-ffff96760803f800.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.4637
Iter 1/10: OSS cache speed: 0.512399
Iter 1/10: ladvise speed: 0.558606
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.475693
Iter 2/10: OSS cache speed: 0.544681
Iter 2/10: ladvise speed: 0.531444
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.469138
Iter 3/10: OSS cache speed: 0.51665
Iter 3/10: ladvise speed: 0.44592
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.45194
Iter 4/10: OSS cache speed: 0.511393
Iter 4/10: ladvise speed: 0.571447
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.496925
Iter 5/10: OSS cache speed: 0.581098
Iter 5/10: ladvise speed: 0.510229
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.489872
Iter 6/10: OSS cache speed: 0.531405
Iter 6/10: ladvise speed: 0.526659
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.523429
Iter 7/10: OSS cache speed: 0.560157
Iter 7/10: ladvise speed: 0.46011
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.501441
Iter 8/10: OSS cache speed: 0.574402
Iter 8/10: ladvise speed: 0.553221
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.49702
Iter 9/10: OSS cache speed: 0.553027
Iter 9/10: ladvise speed: 0.561738
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.52258
Iter 10/10: OSS cache speed: 0.506831
Iter 10/10: ladvise speed: 0.534015
Average uncached read: .48
Average speedup with OSS cached read:  .53 = +10%
Average speedup with ladvise willread:  .52 = +8%
Speedup with OSS cached read less than 20%,  got 10%. Skipping ladvise willread check.
fail_loc=0