== sanity test 255a: check 'lfs ladvise -a willread' ===== 00:03:30 (1746072210)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 4.33095 s, 24.2 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-ffff88012b4d6000.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.896364
Iter 1/10: OSS cache speed: 1.06187
Iter 1/10: ladvise speed: 1.06255
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.888191
Iter 2/10: OSS cache speed: 0.86862
Iter 2/10: ladvise speed: 1.05969
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.957302
Iter 3/10: OSS cache speed: 1.0225
Iter 3/10: ladvise speed: 0.933925
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.779254
Iter 4/10: OSS cache speed: 0.830794
Iter 4/10: ladvise speed: 0.874128
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.868389
Iter 5/10: OSS cache speed: 0.976216
Iter 5/10: ladvise speed: 0.881286
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.754729
Iter 6/10: OSS cache speed: 0.805904
Iter 6/10: ladvise speed: 0.937527
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.793892
Iter 7/10: OSS cache speed: 0.954946
Iter 7/10: ladvise speed: 1.01235
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.819744
Iter 8/10: OSS cache speed: 1.01958
Iter 8/10: ladvise speed: 1.03296
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.891427
Iter 9/10: OSS cache speed: 0.991824
Iter 9/10: ladvise speed: 0.974102
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.851973
Iter 10/10: OSS cache speed: 0.908813
Iter 10/10: ladvise speed: 0.911968
Average uncached read: .85
Average speedup with OSS cached read:  .94 = +10%
Average speedup with ladvise willread:  .96 = +12%
Speedup with OSS cached read less than 20%,  got 10%. Skipping ladvise willread check.
fail_loc=0