== sanity test 255a: check 'lfs ladvise -a willread' ===== 16:50:10 (1746132610)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 4.57354 s, 22.9 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-ffff8800b3afe000.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.955017
Iter 1/10: OSS cache speed: 1.0006
Iter 1/10: ladvise speed: 1.07243
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.988308
Iter 2/10: OSS cache speed: 1.18824
Iter 2/10: ladvise speed: 1.26027
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 1.11145
Iter 3/10: OSS cache speed: 1.129
Iter 3/10: ladvise speed: 1.15463
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.952884
Iter 4/10: OSS cache speed: 1.08176
Iter 4/10: ladvise speed: 1.18328
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.936296
Iter 5/10: OSS cache speed: 1.0783
Iter 5/10: ladvise speed: 1.11819
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.972296
Iter 6/10: OSS cache speed: 1.06568
Iter 6/10: ladvise speed: 0.982549
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.936489
Iter 7/10: OSS cache speed: 0.904076
Iter 7/10: ladvise speed: 0.834596
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.732443
Iter 8/10: OSS cache speed: 0.987759
Iter 8/10: ladvise speed: 1.04026
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.98291
Iter 9/10: OSS cache speed: 0.997425
Iter 9/10: ladvise speed: 1.08216
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.845633
Iter 10/10: OSS cache speed: 1.04645
Iter 10/10: ladvise speed: 1.20177
Average uncached read: .94
Average speedup with OSS cached read:  1.04 = +10%
Average speedup with ladvise willread:  1.09 = +15%
Speedup with OSS cached read less than 20%,  got 10%. Skipping ladvise willread check.
fail_loc=0