=== SYSTEM === 2026-07-06T00:33:20+00:00 NVIDIA RTX A4000, 16376 MiB, 550.144.03 Build cuda_12.4.r12.4/compiler.34097967_0 === CHAPTER CHECKS === --- code/ch02 --- nvcc -O3 -arch=native -lm -o hello hello.cu nvcc -O3 -arch=native -lm -o vector_add vector_add.cu code/ch02/hello Hello from block 0, thread 0 Hello from block 0, thread 1 Hello from block 0, thread 2 Hello from block 0, thread 3 Hello from block 1, thread 0 Hello from block 1, thread 1 Hello from block 1, thread 2 Hello from block 1, thread 3 code/ch02/vector_add OK vector_add --- code/ch03 --- nvcc -O3 -arch=native -lm -o indices indices.cu nvcc -O3 -arch=native -lm -o matrix_add matrix_add.cu nvcc -O3 -arch=native -lm -o grid_stride grid_stride.cu code/ch03/grid_stride OK grid_stride code/ch03/indices block (0,1) thread (0,0) -> row 2 col 0 idx 16 block (0,1) thread (1,0) -> row 2 col 1 idx 17 block (0,1) thread (2,0) -> row 2 col 2 idx 18 block (0,1) thread (3,0) -> row 2 col 3 idx 19 block (0,1) thread (0,1) -> row 3 col 0 idx 24 block (0,1) thread (1,1) -> row 3 col 1 idx 25 block (0,1) thread (2,1) -> row 3 col 2 idx 26 block (0,1) thread (3,1) -> row 3 col 3 idx 27 block (1,1) thread (0,0) -> row 2 col 4 idx 20 block (1,1) thread (1,0) -> row 2 col 5 idx 21 block (1,1) thread (2,0) -> row 2 col 6 idx 22 block (1,1) thread (3,0) -> row 2 col 7 idx 23 block (1,1) thread (0,1) -> row 3 col 4 idx 28 block (1,1) thread (1,1) -> row 3 col 5 idx 29 block (1,1) thread (2,1) -> row 3 col 6 idx 30 block (1,1) thread (3,1) -> row 3 col 7 idx 31 block (1,0) thread (0,0) -> row 0 col 4 idx 4 block (1,0) thread (1,0) -> row 0 col 5 idx 5 block (1,0) thread (2,0) -> row 0 col 6 idx 6 block (1,0) thread (3,0) -> row 0 col 7 idx 7 block (1,0) thread (0,1) -> row 1 col 4 idx 12 block (1,0) thread (1,1) -> row 1 col 5 idx 13 block (1,0) thread (2,1) -> row 1 col 6 idx 14 block (1,0) thread (3,1) -> row 1 col 7 idx 15 block (0,0) thread (0,0) -> row 0 col 0 idx 0 block (0,0) thread (1,0) -> row 0 col 1 idx 1 block (0,0) thread (2,0) -> row 0 col 2 idx 2 block (0,0) thread (3,0) -> row 0 col 3 idx 3 block (0,0) thread (0,1) -> row 1 col 0 idx 8 block (0,0) thread (1,1) -> row 1 col 1 idx 9 block (0,0) thread (2,1) -> row 1 col 2 idx 10 block (0,0) thread (3,1) -> row 1 col 3 idx 11 code/ch03/matrix_add OK matrix_add --- code/ch04 --- nvcc -O3 -arch=native -lm -o bandwidth bandwidth.cu nvcc -O3 -arch=native -lm -o coalesce coalesce.cu code/ch04/bandwidth buffer size: 134217728 floats (537 MB each) traffic per launch (read + write): 1074 MB average time over 10 launches: 2.725 ms achieved bandwidth: 394.0 GB/s OK bandwidth code/ch04/coalesce matrix: 8192 x 8192 floats (268 MB read + 268 MB written per pass) row-order (coalesced): 1.366 ms (392.9 GB/s) column-order (strided) : 5.375 ms (99.9 GB/s) strided / coalesced slowdown: 3.9x OK coalesce --- code/ch05 --- nvcc -O3 -arch=native -lm -o transpose transpose.cu nvcc -O3 -arch=native -lm -o race race.cu code/ch05/race RACE (may vary): reverse_broken: 2046720 of 4194304 elements wrong a data race is undefined behavior: the count above can change from run to run, and 0 wrong is luck, not correctness OK race_fixed code/ch05/transpose transpose: 4096 x 2048 floats (67.1 MB moved per run) OK transpose_naive OK transpose_tiled OK transpose_padded kernel ms GB/s speedup transpose_naive 0.533 125.9 1.00x transpose_tiled 0.277 242.1 1.92x transpose_padded 0.194 346.3 2.75x --- code/ch06 --- nvcc -O3 -arch=native -lm histogram.cu -o histogram nvcc -O3 -arch=native -lm reduce.cu -o reduce code/ch06/histogram histogram (random bytes): 3.298 ms OK histogram histogram (one hot bin): 6.743 ms (2.0x slower) OK histogram_worst_case code/ch06/reduce CPU (double) sum: -151.5765 reduce_atomic: sum -151.6804 32.582 ms reduce_tree: sum -151.5632 0.350 ms reduce_shuffle: sum -151.5666 0.218 ms OK reduce_atomic OK reduce_tree OK reduce_shuffle --- code/ch07 --- nvcc -O3 -arch=native -lm silent_fail.cu -o silent_fail nvcc -O3 -arch=native -lm timing.cu -o timing code/ch07/silent_fail --- part 1: illegal launch, no error checking --- kernel "ran" in 0.1864 ms (says the host clock) out[0] = 0.000000, expected 1.251290 <- the kernel never ran --- part 2: same launch, but now we ask --- cudaGetLastError says: invalid configuration argument --- part 3: legal launch, checked, verified --- OK silent_fail_fixed code/ch07/timing WRONG (host clock, no sync): 0.0034 ms RIGHT (events, warmup, avg of 10): 0.3461 ms = 387.8 GB/s OK timing --- code/ch08 --- nvcc -O3 -arch=native -lm -o matmul_naive matmul_naive.cu code/ch08/matmul_naive matmul: C(1024,1024) = A(1024,1024) @ B(1024,1024), 2.15 GFLOP per run computing CPU reference (single core; this takes a few seconds)... OK matmul_naive CPU: 4628.6 ms 0.46 GFLOP/s GPU: 1.851 ms 1160.4 GFLOP/s speedup: 2501.2x --- code/ch09 --- nvcc -O3 -arch=native -lm -o matmul_ladder matmul_ladder.cu nvcc -O3 -arch=native -lm -o matmul_forward matmul_forward.cu code/ch09/matmul_forward computing CPU references (a few seconds)... matmul_forward: N=8192 C=384 OC=1152 bias=yes OK matmul_forward matmul_forward: 4.879 ms, 1485.4 GFLOP/s matmul_forward_ragged: N=100 C=65 OC=37 bias=NULL OK matmul_forward_ragged code/ch09/matmul_ladder matmul ladder: C(1024,1024) = A(1024,1024) @ B(1024,1024), 2.15 GFLOP per run computing CPU reference (a few seconds)... OK matmul_naive OK matmul_tiled OK matmul_regtile kernel ms GFLOP/s speedup matmul_naive 1.955 1098.6 1.00x matmul_tiled 1.577 1361.7 1.24x matmul_regtile 0.370 5807.6 5.29x --- code/ch10 --- nvcc -O3 -arch=native -lm softmax.cu -o softmax nvcc -O3 -arch=native -lm reduce_row.cu -o reduce_row code/ch10/reduce_row OK rowmax OK rowsum code/ch10/softmax one row of large scores through both kernels (a demonstration): logits: 101.3 99.1 102.7 12.0 100.0 103.9 97.2 100.8 naive: nan nan nan 0.000000 nan nan nan nan safe: 0.051216 0.005675 0.207688 0.000000 0.013958 0.689551 0.000849 0.031064 OK softmax_v65 softmax_v65: N=8192 V=65 0.046 ms ~229 GB/s effective OK softmax_v1000 softmax_v1000: N=8192 V=1000 0.173 ms ~948 GB/s effective OK softmax_rowsum --- code/ch11 --- nvcc -O3 -arch=native -lm layernorm.cu -o layernorm nvcc -O3 -arch=native -lm gelu.cu -o gelu code/ch11/gelu x gelu(x) -2 -0.0454 -1 -0.1588 0 0.0000 1 0.8412 2 1.9546 OK gelu code/ch11/layernorm N=8192 rows, C=384 channels OK layernorm_out OK layernorm_mean OK layernorm_rstd N=1000 rows, C=100 channels OK layernorm_ragged --- code/ch12 --- nvcc -O3 -arch=native -lm encoder.cu -o encoder nvcc -O3 -arch=native -lm crossentropy.cu -o crossentropy code/ch12/crossentropy OK softmax OK crossentropy uniform logits: mean loss 4.174387, expected ln(65) = 4.174387 OK uniform_loss_4.17 code/ch12/encoder OK encoder --- code/ch13 --- nvcc -O3 -arch=native -lm attention.cu -o attention code/ch13/attention OK attention_out OK attention_att OK attention_causal --- code/ch16 --- cc -O2 -lm -o toy_backprop toy_backprop.c code/ch16/toy_backprop forward: z = 7.0, y = 49.0 backward: dx = 42.0, dw = 28.0, db = 14.0 finite difference dx ~= 42.002 OK toy_backprop === GPT BUILD === rm -f prepare_data train_gpt generate_gpt grad_check cc -O2 -lm -o prepare_data prepare_data.c nvcc -O3 -arch=native -lm -o train_gpt train_gpt.cu nvcc -O3 -arch=native -lm -o generate_gpt generate_gpt.cu nvcc -O3 -arch=native -lm -o grad_check grad_check.cu === DATA === curl -L -o input.txt https://raw.githubusercontent.com/karpathy/char-rnn/master/data/tinyshakespeare/input.txt % Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed 0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0 100 1089k 100 1089k 0 0 4798k 0 --:--:-- --:--:-- --:--:-- 4819k tokens: 1115394 | vocab: 65 | train: 1003854 | val: 111540 === GRAD CHECK === analytic -0.074804 numerical -0.074863 diff 0.000060 OK grad_check_wte0 === TRAIN 5000 === parameters: 10770816 step 1 | loss 4.2383 | lr 0.000010 | 7300 tok/s step 100 | loss 2.4751 | lr 0.001000 | 7039 tok/s step 200 | loss 2.3741 | lr 0.000999 | 6967 tok/s val 250 | loss 2.2469 step 300 | loss 2.1620 | lr 0.000996 | 7033 tok/s step 400 | loss 1.8983 | lr 0.000992 | 7017 tok/s step 500 | loss 1.7598 | lr 0.000985 | 7035 tok/s val 500 | loss 1.9397 step 600 | loss 1.7097 | lr 0.000977 | 7024 tok/s step 700 | loss 1.7504 | lr 0.000967 | 7036 tok/s val 750 | loss 1.8425 step 800 | loss 1.6235 | lr 0.000955 | 7022 tok/s step 900 | loss 1.5730 | lr 0.000942 | 7052 tok/s step 1000 | loss 1.6028 | lr 0.000927 | 7029 tok/s val 1000 | loss 1.7558 saved model.bin at step 1000 step 1100 | loss 1.6541 | lr 0.000911 | 7029 tok/s step 1200 | loss 1.6146 | lr 0.000893 | 7051 tok/s val 1250 | loss 1.6679 step 1300 | loss 1.4642 | lr 0.000873 | 7035 tok/s step 1400 | loss 1.3288 | lr 0.000853 | 7034 tok/s step 1500 | loss 1.3054 | lr 0.000831 | 7043 tok/s val 1500 | loss 1.6317 step 1600 | loss 1.3982 | lr 0.000807 | 7063 tok/s step 1700 | loss 1.3385 | lr 0.000783 | 7052 tok/s val 1750 | loss 1.6163 step 1800 | loss 1.2542 | lr 0.000758 | 7047 tok/s step 1900 | loss 1.3436 | lr 0.000732 | 7050 tok/s step 2000 | loss 1.2770 | lr 0.000705 | 7062 tok/s val 2000 | loss 1.5911 saved model.bin at step 2000 step 2100 | loss 1.2688 | lr 0.000678 | 7052 tok/s step 2200 | loss 1.1882 | lr 0.000650 | 7042 tok/s val 2250 | loss 1.6044 step 2300 | loss 1.3317 | lr 0.000622 | 7046 tok/s step 2400 | loss 1.1211 | lr 0.000593 | 7036 tok/s step 2500 | loss 1.2006 | lr 0.000564 | 7059 tok/s val 2500 | loss 1.6112 step 2600 | loss 1.1568 | lr 0.000536 | 7065 tok/s step 2700 | loss 1.2186 | lr 0.000507 | 7067 tok/s val 2750 | loss 1.6321 step 2800 | loss 1.1401 | lr 0.000478 | 7069 tok/s step 2900 | loss 1.0421 | lr 0.000450 | 7064 tok/s step 3000 | loss 1.1062 | lr 0.000422 | 7057 tok/s val 3000 | loss 1.6381 saved model.bin at step 3000 step 3100 | loss 0.9624 | lr 0.000395 | 7069 tok/s step 3200 | loss 1.0200 | lr 0.000368 | 7073 tok/s val 3250 | loss 1.6753 step 3300 | loss 1.0242 | lr 0.000342 | 7089 tok/s step 3400 | loss 1.0527 | lr 0.000317 | 7055 tok/s step 3500 | loss 0.9729 | lr 0.000293 | 7063 tok/s val 3500 | loss 1.7316 step 3600 | loss 0.9506 | lr 0.000269 | 7077 tok/s step 3700 | loss 0.9488 | lr 0.000247 | 7067 tok/s val 3750 | loss 1.7931 step 3800 | loss 0.9607 | lr 0.000227 | 7055 tok/s step 3900 | loss 0.9824 | lr 0.000207 | 7056 tok/s step 4000 | loss 0.7658 | lr 0.000189 | 7031 tok/s val 4000 | loss 1.8825 saved model.bin at step 4000 step 4100 | loss 0.8902 | lr 0.000173 | 7044 tok/s step 4200 | loss 0.7832 | lr 0.000158 | 7047 tok/s val 4250 | loss 1.9381 step 4300 | loss 0.8469 | lr 0.000145 | 7036 tok/s step 4400 | loss 0.8653 | lr 0.000133 | 7053 tok/s step 4500 | loss 0.8695 | lr 0.000123 | 7035 tok/s val 4500 | loss 1.9576 step 4600 | loss 0.7353 | lr 0.000115 | 7048 tok/s step 4700 | loss 0.7704 | lr 0.000108 | 7046 tok/s val 4750 | loss 1.9924 step 4800 | loss 0.7446 | lr 0.000104 | 7032 tok/s step 4900 | loss 0.8131 | lr 0.000101 | 7042 tok/s step 5000 | loss 0.7931 | lr 0.000100 | 7054 tok/s val 5000 | loss 2.0483 saved model.bin at step 5000 === GENERATE ROMEO === ROMEO: Ay not sustom's master and by earor-woo's love; She damned life, lest have had some removed, Lest in neither slander man, and might have Because the moon his commission. MARCIUS: No, I'll consent the choler is prince: I am gone to great the last of my master; That's smules not put to my counsel. LARTIUS: He'll down away; alas, my liege, may stand And in the truth of one sons with that for night But upon'sy. Let thou go; How sometimes thee on the ground the vault? Though thy wife will then to thee to thine, And doth me, thy force should thee from thy brother As thou didst uncontent? I think thee, that would ens Of gracious that here were most under his pleasing pay a wordfather, a mother; a boote ardone And this one in so to be a child, and so meek To lie in; and so, as the which I do ha === GENERATE JULIET === JULIET: And fearn gather nothing by thy lance. Is my daughter's most reason can strengthen's stand My separance up and hereport of their children, My mildness and constant seize in purge With informal enrage, that the habit ours. Say thou never have me once what I have: Not hear then beat his; 'twere thy toother such And see the gates that which he can say. KING EDWARD IV: The gods be thereof there! O thee, climbs: This is there: 'for thou re's more there's service: 'Tis thou there? Why, villain, if thou know'st this noble armed, It must are the alive. But what is this? GLOUCESTER: It should be, there's no consort or charge. YORK: At what command? CLARENCE: It is. For that docts but loss this thought of thee, As doubt the truth of the whole head. GLOUCESTER: Your brother is and Polixenes, Ho === ARTIFACTS === -rw-r--r-- 1 root root 124M Jul 6 02:12 model.bin -rw-r--r-- 1 root root 3.9M Jul 6 00:34 train.bin -rw-r--r-- 1 root root 436K Jul 6 00:34 val.bin -rw-r--r-- 1 root root 73 Jul 6 00:34 vocab.bin 75eb8311e2bdec22b0c0e40084fb39fb1ed190662d3cd51f26e9f4b37ee06691 model.bin 464eb51d66b5b643889064b82c75607e2d756df11ec960e5e6aaaf03c71734be vocab.bin a3f591a5c0dfa7f54a2ec0ab39c4561d6475f1af28264f38076932ca425d5037 train.bin 836220b36a012c19cd285816001700117edef4f8e1098130b234d4b8fa766d86 val.bin === DONE === 2026-07-06T02:12:17+00:00