== sanity test 255a: check 'lfs ladvise -a willread' ===== 20:14:57 (1781223297)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 12.9401 s, 8.1 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-ffff93c74620e000.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.345999
Iter 1/10: OSS cache speed: 0.352897
Iter 1/10: ladvise speed: 0.322005
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.315545
Iter 2/10: OSS cache speed: 0.310674
Iter 2/10: ladvise speed: 0.314035
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.290255
Iter 3/10: OSS cache speed: 0.343594
Iter 3/10: ladvise speed: 0.327563
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.320872
Iter 4/10: OSS cache speed: 0.344406
Iter 4/10: ladvise speed: 0.317742
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.275316
Iter 5/10: OSS cache speed: 0.300356
Iter 5/10: ladvise speed: 0.269093
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.277843
Iter 6/10: OSS cache speed: 0.278952
Iter 6/10: ladvise speed: 0.302601
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.292123
Iter 7/10: OSS cache speed: 0.285238
Iter 7/10: ladvise speed: 0.299821
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.275766
Iter 8/10: OSS cache speed: 0.280574
Iter 8/10: ladvise speed: 0.308578
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.309402
Iter 9/10: OSS cache speed: 0.308597
Iter 9/10: ladvise speed: 0.309228
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.286204
Iter 10/10: OSS cache speed: 0.318256
Iter 10/10: ladvise speed: 0.318652
Average uncached read: .29
Average speedup with OSS cached read:  .31 = +6%
Average speedup with ladvise willread:  .30 = +3%
Speedup with OSS cached read less than 20%,  got 6%. Skipping ladvise willread check.
fail_loc=0