Align critical structures on 128 bytes and make all their sizes multiples of 32 bytes.

src/cell.h

@@ -44,7 +44,7 @@ struct space;
  * The maximum was lowered by a further factor of 2 to be on the safe side.*/
 #define cell_max_tag (1 << 29)
 
-#define cell_align 32
+#define cell_align 128
 
 /* Global variables. */
 extern int cell_next_tag;
@@ -205,7 +205,7 @@ struct cell {
 
 #endif
 
-} __attribute__((aligned(cell_align)));
+} __attribute__((aligned(32)));
 
 /* Convert cell location to ID. */
 #define cell_getid(cdim, i, j, k) \

src/gravity/Default/gravity_part.h

@@ -53,6 +53,6 @@ struct gpart {
      which this gpart is linked. */
   long long id_or_neg_offset;
 
-} __attribute__((aligned(gpart_align)));
+} __attribute__((aligned(32)));
 
 #endif /* SWIFT_DEFAULT_GRAVITY_PART_H */

src/hydro/Default/hydro_part.h

@@ -33,7 +33,7 @@ struct xpart {
   /* Old density. */
   float omega;
 
-} __attribute__((aligned(xpart_align)));
+} __attribute__((aligned(32)));
 
 /* Data of a single particle. */
 struct part {
@@ -120,6 +120,6 @@ struct part {
   /* Pointer to corresponding gravity part. */
   struct gpart* gpart;
 
-} __attribute__((aligned(part_align)));
+} __attribute__((aligned(32)));
 
 #endif /* SWIFT_DEFAULT_HYDRO_PART_H */

src/hydro/Gadget2/hydro_part.h

@@ -28,7 +28,7 @@ struct xpart {
   /* Velocity at the last full step. */
   float v_full[3];
 
-} __attribute__((aligned(xpart_align)));
+} __attribute__((aligned(32)));
 
 /* Data of a single particle. */
 struct part {
@@ -110,6 +110,6 @@ struct part {
   /* Pointer to corresponding gravity part. */
   struct gpart* gpart;
 
-} __attribute__((aligned(part_align)));
+} __attribute__((aligned(32)));
 
 #endif /* SWIFT_GADGET2_HYDRO_PART_H */

src/hydro/Gizmo/hydro_part.h

@@ -26,7 +26,7 @@ struct xpart {
   /* Velocity at the last full step. */
   float v_full[3];
 
-} __attribute__((aligned(xpart_align)));
+} __attribute__((aligned(32)));
 
 /* Data of a single particle. */
 struct part {
@@ -196,4 +196,4 @@ struct part {
   /* Associated gravitas. */
   struct gpart *gpart;
 
-} __attribute__((aligned(part_align)));
+} __attribute__((aligned(32)));

src/hydro/Minimal/hydro_part.h

@@ -47,7 +47,7 @@ struct xpart {
 
   float v_full[3]; /*!< Velocity at the last full step. */
 
-} __attribute__((aligned(xpart_align)));
+} __attribute__((aligned(32)));
 
 /**
  * @brief Particle fields for the SPH particles
@@ -120,6 +120,6 @@ struct part {
 
   struct gpart* gpart; /*!< Pointer to corresponding gravity part. */
 
-} __attribute__((aligned(part_align)));
+} __attribute__((aligned(32)));
 
 #endif /* SWIFT_MINIMAL_HYDRO_PART_H */

src/part.h

@@ -34,9 +34,9 @@
 #include "const.h"
 
 /* Some constants. */
-#define part_align 64
-#define xpart_align 32
-#define gpart_align 32
+#define part_align 128
+#define xpart_align 128
+#define gpart_align 128
 
 /* Import the right hydro particle definition */
 #if defined(MINIMAL_SPH)