Tutorials/Accelerated Python: Write checkpoints to /tmp in notebooks 05 and 06.

Fixes performance issues when the Git repository is on a network or slow
filesystem by writing checkpoint files to /tmp instead of the working directory.

Author: brycelelbach

tutorials/accelerated-python/notebooks/fundamentals/05__memory_spaces__power_iteration.ipynb

@@ -187,7 +187,7 @@
     "            print(f\"Step {i}: residual = {res:.3e}\")\n",
     "\n",
     "        # Save a checkpoint.\n",
-    "        np.savetxt(f\"host_{i}.txt\", x)\n",
+    "        np.savetxt(f\"/tmp/host_{i}.txt\", x)\n",
     "\n",
     "        # Convergence check.\n",
     "        if res < cfg.residual_threshold:\n",
@@ -267,7 +267,7 @@
     "        if cfg.progress:\n",
     "            print(f\"Step {i}: residual = {res:.3e}\")\n",
     "\n",
-    "        np.savetxt(f\"host_{i}.txt\", x) # Save a checkpoint.\n",
+    "        np.savetxt(f\"/tmp/host_{i}.txt\", x) # Save a checkpoint.\n",
     "\n",
     "        # Convergence check\n",
     "        if res < cfg.residual_threshold:\n",

tutorials/accelerated-python/notebooks/fundamentals/06__asynchrony__power_iteration.ipynb

@@ -130,7 +130,7 @@
     "      print(f\"step {i}: residual = {res:.3e}\")\n",
     "\n",
     "    # Copy from device to host and save a checkpoint.\n",
-    "    np.savetxt(f\"device_{i}.txt\", cp.asnumpy(x))\n",
+    "    np.savetxt(f\"/tmp/device_{i}.txt\", cp.asnumpy(x))\n",
     "\n",
     "    if res < cfg.residual_threshold:\n",
     "      break\n",
@@ -268,7 +268,7 @@
     "- You can synchronize on an event (or an entire stream) by calling `.synchronize` on it.\n",
     "- Memory transfers will block by default. You can launch them asynchronously with `cp.asarray(..., blocking=False)` (for host to device transfers) and `cp.asnumpy(..., blocking=False)` (for device to host transfers).\n",
     "\n",
-    "**TODO:** The code below contains the baseline implementation with NVTX annotations already added. Modify it to improve performance by adding asynchrony."
+    "**TODO:** Copy your NVTX annotated code from before into the cell below (make sure not to overwrite the %%writefile), and modify the code to improve performance by adding asynchrony."
    ]
   },
   {

tutorials/accelerated-python/notebooks/fundamentals/solutions/05__memory_spaces__power_iteration__SOLUTION.ipynb

@@ -187,7 +187,7 @@
     "            print(f\"Step {i}: residual = {res:.3e}\")\n",
     "\n",
     "        # Save a checkpoint.\n",
-    "        np.savetxt(f\"host_{i}.txt\", x)\n",
+    "        np.savetxt(f\"/tmp/host_{i}.txt\", x)\n",
     "\n",
     "        # Convergence check.\n",
     "        if res < cfg.residual_threshold:\n",
@@ -273,7 +273,7 @@
     "            print(f\"Step {i}: residual = {res:.3e}\")\n",
     "\n",
     "        # Transfer x from device to host and save a checkpoint.\n",
-    "        np.savetxt(f\"device_{i}.txt\", cp.asnumpy(x))\n",
+    "        np.savetxt(f\"/tmp/device_{i}.txt\", cp.asnumpy(x))\n",
     "\n",
     "        # Convergence check.\n",
     "        if res < cfg.residual_threshold:\n",

tutorials/accelerated-python/notebooks/fundamentals/solutions/06__asynchrony__power_iteration__SOLUTION.ipynb

@@ -136,8 +136,8 @@
     "          if cfg.progress:\n",
     "            print(f\"step {i}: residual = {res_host:.3e}\")\n",
     "\n",
-    "          np.savetxt(f\"device_{i}.txt\", x_host) # Copy from device to host and\n",
-    "                                                # save a checkpoint.\n",
+    "          # Copy from device to host and save a checkpoint.\n",
+    "          np.savetxt(f\"/tmp/device_{i}.txt\", x_host)\n",
     "\n",
     "          if res_host < cfg.residual_threshold:\n",
     "            break\n",
@@ -355,7 +355,8 @@
     "          if cfg.progress:\n",
     "            print(f\"step {i}: residual = {res_host:.3e}\")\n",
     "\n",
-    "          np.savetxt(f\"device_{i}.txt\", x_host) # Save a checkpoint.\n",
+    "          # Save a checkpoint.\n",
+    "          np.savetxt(f\"/tmp/device_{i}.txt\", x_host)\n",
     "\n",
     "          if res_host < cfg.residual_threshold:\n",
     "            break\n",