== sanity test 255a: check 'lfs ladvise -a willread' ===== 21:04:02 (1778288642)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 11.5558 s, 9.1 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-ffff925011ec5800.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.460513
Iter 1/10: OSS cache speed: 0.512647
Iter 1/10: ladvise speed: 0.549954
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.575713
Iter 2/10: OSS cache speed: 0.586929
Iter 2/10: ladvise speed: 0.60728
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.543045
Iter 3/10: OSS cache speed: 0.672166
Iter 3/10: ladvise speed: 0.697285
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.617182
Iter 4/10: OSS cache speed: 0.678057
Iter 4/10: ladvise speed: 0.668923
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.593524
Iter 5/10: OSS cache speed: 0.693197
Iter 5/10: ladvise speed: 0.752568
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.640524
Iter 6/10: OSS cache speed: 0.732186
Iter 6/10: ladvise speed: 0.800286
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.725874
Iter 7/10: OSS cache speed: 0.832875
Iter 7/10: ladvise speed: 0.833718
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.735548
Iter 8/10: OSS cache speed: 1.02355
Iter 8/10: ladvise speed: 1.69661
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 1.04174
Iter 9/10: OSS cache speed: 1.3569
Iter 9/10: ladvise speed: 1.45825
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 1.41473
Iter 10/10: OSS cache speed: 1.92732
Iter 10/10: ladvise speed: 2.22586
Average uncached read: .73
Average speedup with OSS cached read:  .90 = +23%
Average speedup with ladvise willread:  1.02 = +39%
fail_loc=0