== sanity test 255a: check 'lfs ladvise -a willread' ===== 12:57:29 (1774889849)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 7.98257 s, 13.1 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-ffff8a91d1003800.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.442846
Iter 1/10: OSS cache speed: 0.487499
Iter 1/10: ladvise speed: 0.532973
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.467969
Iter 2/10: OSS cache speed: 0.508025
Iter 2/10: ladvise speed: 0.579085
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.551132
Iter 3/10: OSS cache speed: 0.559712
Iter 3/10: ladvise speed: 0.638942
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.591834
Iter 4/10: OSS cache speed: 0.686571
Iter 4/10: ladvise speed: 0.663924
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.718068
Iter 5/10: OSS cache speed: 0.88129
Iter 5/10: ladvise speed: 1.20225
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.824935
Iter 6/10: OSS cache speed: 1.0453
Iter 6/10: ladvise speed: 1.12896
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.838771
Iter 7/10: OSS cache speed: 1.06626
Iter 7/10: ladvise speed: 1.25154
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 1.32399
Iter 8/10: OSS cache speed: 2.16919
Iter 8/10: ladvise speed: 2.06202
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 2.01114
Iter 9/10: OSS cache speed: 2.14443
Iter 9/10: ladvise speed: 2.3301
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 2.01501
Iter 10/10: OSS cache speed: 2.36219
Iter 10/10: ladvise speed: 2.29954
Average uncached read: .97
Average speedup with OSS cached read:  1.19 = +22%
Average speedup with ladvise willread:  1.26 = +29%
fail_loc=0